Update test-layout

Use the new output serialization in test-layout
to store both the input and output in the same
file.

26 files changed, 13864 insertions, 349 deletions

diff --git a/tests/layouts/bratwurst.expected b/tests/layouts/bratwurst.expected
deleted file mode 100644
index f81dbaeb..00000000
--- a/tests/layouts/bratwurst.expected
+++ /dev/null
@@ -1,32 +0,0 @@
-Bratwurst
---- parameters
-
-wrapped: 0
-ellipsized: 0
-lines: 1
-width: 102400
-
---- attributes
-
-range 0 4
-range 4 2147483647
-4 4294967295 style italic
-range 2147483647 2147483647
-
---- directions
-
-0 0 0 0 0 0 0 0 0 
-
---- cursor positions
-
-0(0) 1(0) 2(0) 3(0) 4(0) 5(0) 6(0) 7(0) 8(0) 8(1) 
-
---- lines
-
-i=1, index=0, paragraph-start=1, dir=ltr 'Bratwurst'
-
---- runs
-
-i=1, index=0, chars=4, level=0, gravity=south, flags=0, font=OMITTED, script=latin, language=en-us, 'Brat'
-i=2, index=4, chars=5, level=0, gravity=south, flags=0, font=OMITTED, script=latin, language=en-us, 'wurst'
-i=3, index=9, no run, line end
diff --git a/tests/layouts/bratwurst.layout b/tests/layouts/bratwurst.layout
index 65104276..641cc37a 100644
--- a/tests/layouts/bratwurst.layout
+++ b/tests/layouts/bratwurst.layout
@@ -1,4 +1,24 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
+  "comment" : [
+    "A case with a single word made up of two items,",
+    "expected to produce a single overlong line."
+  ],
   "text" : "Bratwurst",
   "attributes" : [
     {
@@ -7,15 +27,170 @@
       "value" : "italic"
     }
   ],
-  "font" : "Sans Bold 32",
-  "tabs" : {
-    "positions-in-pixels" : true,
-    "positions" : [
-      0,
-      50,
-      100
+  "font" : "Cantarell Bold 32 @wght=604",
+  "width" : 87040,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 197632,
+    "height" : 53248,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-boundary" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 9,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 4,
+            "text" : "Brat",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell Bold 32 @wght=604",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 29,
+                "width" : 27648,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 409,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 244,
+                "width" : 22528,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 430,
+                "width" : 16384,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              }
+            ]
+          },
+          {
+            "offset" : 4,
+            "length" : 5,
+            "text" : "wurst",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell Bold Oblique 32 @wght=604",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 467,
+                "width" : 34816,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 438,
+                "width" : 24576,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 409,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 417,
+                "width" : 20480,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 430,
+                "width" : 16384,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          }
+        ]
+      }
     ]
-  },
-  "width" : 102400,
-  "line-spacing" : 1.2999999523162842
+  }
 }
\ No newline at end of file
diff --git a/tests/layouts/valid-1.layout b/tests/layouts/valid-1.layout
index 9289830b..0a966d4f 100644
--- a/tests/layouts/valid-1.layout
+++ b/tests/layouts/valid-1.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "This is a test of the automatic emergency brake!\n",
   "attributes" : [
     {
@@ -16,5 +32,617 @@
   ],
   "font" : "Cantarell 11",
   "ellipsize" : "end",
-  "width" : 225280
-}
+  "width" : 225280,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : true,
+    "width" : 225280,
+    "height" : 37888,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 48,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 22,
+            "text" : "This is a test of the ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 187,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 319,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 417,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 417,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 7
+              },
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 430,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 10
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 11
+              },
+              {
+                "glyph" : 417,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 12
+              },
+              {
+                "glyph" : 430,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 13
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 14
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 15
+              },
+              {
+                "glyph" : 311,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 16
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 17
+              },
+              {
+                "glyph" : 430,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 18
+              },
+              {
+                "glyph" : 319,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 19
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 20
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 21
+              }
+            ]
+          },
+          {
+            "offset" : 22,
+            "length" : 11,
+            "text" : "automatic e",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 22,
+                "end" : 41,
+                "type" : "foreground",
+                "value" : "#00000000ffff"
+              },
+              {
+                "start" : 22,
+                "end" : 41,
+                "type" : "underline",
+                "value" : "single"
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 438,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 430,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 358,
+                "width" : 13312,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 430,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 7
+              },
+              {
+                "glyph" : 273,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 10
+              }
+            ]
+          },
+          {
+            "offset" : 33,
+            "length" : 15,
+            "text" : "mergency brake!",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : "Cantarell 11",
+            "flags" : 2,
+            "extra-attributes" : [
+              {
+                "end" : 2147483647,
+                "type" : "fallback",
+                "value" : false
+              },
+              {
+                "start" : 22,
+                "end" : 41,
+                "type" : "foreground",
+                "value" : "#00000000ffff"
+              },
+              {
+                "start" : 22,
+                "end" : 41,
+                "type" : "underline",
+                "value" : "single"
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1062,
+                "width" : 20480,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 49,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-10.layout b/tests/layouts/valid-10.layout
index 0d36a38d..51dc9ad0 100644
--- a/tests/layouts/valid-10.layout
+++ b/tests/layouts/valid-10.layout
@@ -1,8 +1,349 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "Hello שלום Γειά σας\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "justify" : true,
   "ellipsize" : "end",
-  "width" : 102400
-}
+  "width" : 102400,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : true,
+    "width" : 102400,
+    "height" : 38912,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 30,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 6,
+            "text" : "Hello ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 76,
+                "width" : 11264,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              }
+            ]
+          },
+          {
+            "offset" : 6,
+            "length" : 8,
+            "text" : "שלום",
+            "bidi-level" : 1,
+            "gravity" : "south",
+            "language" : "he",
+            "script" : "hebrew",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1332,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1331,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 1344,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 14,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "he",
+            "script" : "hebrew",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 3,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 15,
+            "length" : 2,
+            "text" : "Γ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "el",
+            "script" : "greek",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 677,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 17,
+            "length" : 13,
+            "text" : "ειά σας",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : "Cantarell 11",
+            "flags" : 2,
+            "extra-attributes" : [
+              {
+                "end" : 2147483647,
+                "type" : "fallback",
+                "value" : false
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1062,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 31,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-11.layout b/tests/layouts/valid-11.layout
index a044cc53..683cf696 100644
--- a/tests/layouts/valid-11.layout
+++ b/tests/layouts/valid-11.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "double low error\n",
   "attributes" : [
     {
@@ -38,5 +54,358 @@
   ],
   "font" : "Cantarell 11",
   "wrap" : "char",
-  "width" : 225280
-}
+  "width" : 225280,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 109568,
+    "height" : 38912,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 16,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 6,
+            "text" : "double",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "end" : 6,
+                "type" : "underline",
+                "value" : "double"
+              },
+              {
+                "end" : 6,
+                "type" : "overline",
+                "value" : "single"
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 280,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 438,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 272,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              }
+            ]
+          },
+          {
+            "offset" : 6,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 7,
+            "length" : 3,
+            "text" : "low",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 7,
+                "end" : 10,
+                "type" : "underline",
+                "value" : "low"
+              },
+              {
+                "start" : 7,
+                "end" : 10,
+                "type" : "strikethrough",
+                "value" : true
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 467,
+                "width" : 11264,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              }
+            ]
+          },
+          {
+            "offset" : 10,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 11,
+            "length" : 5,
+            "text" : "error",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 11,
+                "end" : 16,
+                "type" : "rise",
+                "value" : 1024
+              },
+              {
+                "start" : 11,
+                "end" : 16,
+                "type" : "underline",
+                "value" : "error"
+              }
+            ],
+            "y-offset" : 1024,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 409,
+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 409,
+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 409,
+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 17,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-12.layout b/tests/layouts/valid-12.layout
index 1c9fa227..96362eb3 100644
--- a/tests/layouts/valid-12.layout
+++ b/tests/layouts/valid-12.layout
@@ -1,6 +1,21 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "a       b       c       d
e     f       g       h\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "tabs" : {
     "positions-in-pixels" : true,
@@ -11,5 +26,720 @@
       150,
       200
     ]
+  },
+  "output" : {
+    "is-wrapped" : true,
+    "is-ellipsized" : false,
+    "width" : 113664,
+    "height" : 59392,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 28,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 25,
+            "text" : "a       b       c       d",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 7
+              },
+              {
+                "glyph" : 272,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 10
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 11
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 12
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 13
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 14
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 15
+              },
+              {
+                "glyph" : 273,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 16
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 17
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 18
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 19
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 20
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 21
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 22
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 23
+              },
+              {
+                "glyph" : 280,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 24
+              }
+            ]
+          },
+          {
+            "offset" : 25,
+            "length" : 3,
+            "text" : "
",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 268443688,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 28,
+        "length" : 23,
+        "paragraph-start" : false,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 28,
+            "length" : 23,
+            "text" : "e     f       g       h",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 311,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 7
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 10
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 11
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 12
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 13
+              },
+              {
+                "glyph" : 312,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 14
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 15
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 16
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 17
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 18
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 19
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 20
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 21
+              },
+              {
+                "glyph" : 319,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 22
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 52,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
   }
-}
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-13.layout b/tests/layouts/valid-13.layout
index a9f10f86..3bb98ce7 100644
--- a/tests/layouts/valid-13.layout
+++ b/tests/layouts/valid-13.layout
@@ -1,6 +1,21 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "a       b       c       d
e     f       g       h\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "tabs" : {
     "positions-in-pixels" : true,
@@ -12,5 +27,729 @@
       200
     ]
   },
-  "single-paragraph" : true
-}
+  "single-paragraph" : true,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 219136,
+    "height" : 21504,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
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+        "expandable-space" : true
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+      },
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+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
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+      },
+      {
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+        "expandable-space" : true
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+      {
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+        "cursor-position" : true,
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+      {
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+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true
+      },
+      {
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+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
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+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
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+        "mandatory-break" : true,
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+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
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+        "length" : 52,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
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+            "text" : "a       b       c       d",
+            "bidi-level" : 0,
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+            "language" : "en-us",
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+            "font" : "Cantarell 11",
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+              }
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+            "length" : 3,
+            "text" : "
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+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
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+                "value" : 2
+              }
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+            "end-x-offset" : 0,
+            "glyphs" : [
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+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 28,
+            "length" : 24,
+            "text" : "e     f       g       h\n",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
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+                "value" : 2
+              }
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+            "end-x-offset" : 0,
+            "glyphs" : [
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+                "width" : 8192,
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+              {
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+              },
+              {
+                "glyph" : 319,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 22
+              },
+              {
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+                "is-cluster-start" : true,
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+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-14.layout b/tests/layouts/valid-14.layout
index 116cc94f..255f51da 100644
--- a/tests/layouts/valid-14.layout
+++ b/tests/layouts/valid-14.layout
@@ -1,8 +1,452 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "你好 Hello שלום Γειά σας\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "ellipsize" : "start",
   "width" : 161792,
-  "line-spacing" : 1.5
-}
+  "line-spacing" : 1.5,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : true,
+    "width" : 161792,
+    "height" : 48128,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 37,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 3,
+            "text" : "你",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : "Cantarell 11",
+            "flags" : 2,
+            "extra-attributes" : [
+              {
+                "end" : 2147483647,
+                "type" : "fallback",
+                "value" : true
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1058,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 1058,
+                "width" : 4096,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 1058,
+                "width" : 4096,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 3,
+            "length" : 4,
+            "text" : "好 ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "xx",
+            "script" : "han",
+            "font" : "Droid Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1300,
+                "width" : 15360,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268435488,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              }
+            ]
+          },
+          {
+            "offset" : 7,
+            "length" : 6,
+            "text" : "Hello ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 76,
+                "width" : 11264,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              }
+            ]
+          },
+          {
+            "offset" : 13,
+            "length" : 8,
+            "text" : "שלום",
+            "bidi-level" : 1,
+            "gravity" : "south",
+            "language" : "he",
+            "script" : "hebrew",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1332,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1331,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 1344,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 21,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "he",
+            "script" : "hebrew",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 3,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 22,
+            "length" : 15,
+            "text" : "Γειά σας",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "el",
+            "script" : "greek",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 677,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 808,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 812,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 837,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 822,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 804,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 11
+              },
+              {
+                "glyph" : 821,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 13
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 38,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-15.layout b/tests/layouts/valid-15.layout
index 9f584ba6..ac7ab3e9 100644
--- a/tests/layouts/valid-15.layout
+++ b/tests/layouts/valid-15.layout
@@ -1,8 +1,990 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "Lets see if this text is long enough to wrap due to height limitations. It might, or it might not.\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "ellipsize" : "end",
   "width" : 153600,
-  "height" : 40960
-}
+  "height" : 40960,
+  "output" : {
+    "is-wrapped" : true,
+    "is-ellipsized" : true,
+    "width" : 153600,
+    "height" : 36864,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
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+        "word-start" : true,
+        "word-boundary" : true
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+        "word-boundary" : true
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+        "word-start" : true,
+        "word-boundary" : true
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+        "break-inserts-hyphen" : true
+      },
+      {
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+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
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+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
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+        "break-inserts-hyphen" : true
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+      {
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
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+      },
+      {
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+        "break-inserts-hyphen" : true
+      },
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+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
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+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
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+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
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+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
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+        "length" : 25,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
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+                "width" : 0,
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+                "log-cluster" : 24
+              }
+            ]
+          }
+        ]
+      },
+      {
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+        "length" : 73,
+        "paragraph-start" : false,
+        "direction" : "ltr",
+        "runs" : [
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+            "length" : 20,
+            "text" : "long enough to wrap ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
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+              },
+              {
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+              },
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+              },
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+              },
+              {
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+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 19
+              }
+            ]
+          },
+          {
+            "offset" : 45,
+            "length" : 53,
+            "text" : "due to height limitations. It might, or it might not.",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : "Cantarell 11",
+            "flags" : 2,
+            "extra-attributes" : [
+              {
+                "end" : 2147483647,
+                "type" : "fallback",
+                "value" : false
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1062,
+                "width" : 16384,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-16.layout b/tests/layouts/valid-16.layout
index e2a82d96..0f1b8698 100644
--- a/tests/layouts/valid-16.layout
+++ b/tests/layouts/valid-16.layout
@@ -1,9 +1,998 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "Lets see if this text is long enough to wrap due to height limitations. It might, or it might not.\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "wrap" : "word-char",
   "ellipsize" : "end",
   "width" : 153600,
-  "height" : -2
-}
+  "height" : -2,
+  "output" : {
+    "is-wrapped" : true,
+    "is-ellipsized" : true,
+    "width" : 153600,
+    "height" : 56320,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
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+        "line-break" : true,
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+        "break-inserts-hyphen" : true
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+        "break-inserts-hyphen" : true
+      },
+      {
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
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+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
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+      {
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+        "white" : true,
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+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
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+        "cursor-position" : true,
+        "word-start" : true,
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+      },
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+      },
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+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
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+        "word-start" : true,
+        "word-boundary" : true
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
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+      },
+      {
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+        "break-inserts-hyphen" : true
+      },
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+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
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+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
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+        "break-inserts-hyphen" : true
+      },
+      {
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
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+      {
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+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
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+        "word-start" : true,
+        "word-boundary" : true
+      },
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+        "char-break" : true,
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+        "break-inserts-hyphen" : true
+      },
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+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
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+        "direction" : "ltr",
+        "runs" : [
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+            "bidi-level" : 0,
+            "gravity" : "south",
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+        "direction" : "ltr",
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+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-17.layout b/tests/layouts/valid-17.layout
index 062cc241..8d0ff072 100644
--- a/tests/layouts/valid-17.layout
+++ b/tests/layouts/valid-17.layout
@@ -1,7 +1,306 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "some|bla|bla|bla\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "justify" : true,
-  "width" : 102400
-}
+  "width" : 102400,
+  "output" : {
+    "is-wrapped" : true,
+    "is-ellipsized" : false,
+    "width" : 102400,
+    "height" : 56320,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
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+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
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+        "char-break" : true,
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+        "word-start" : true,
+        "word-boundary" : true
+      },
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
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+        "start-index" : 0,
+        "length" : 13,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 13,
+            "text" : "some|bla|bla|",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
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+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
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+                "width" : 9216,
+                "x-offset" : 1024,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
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+              {
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+                "width" : 14336,
+                "x-offset" : 1024,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
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+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-18.layout b/tests/layouts/valid-18.layout
index 85e9a7d1..e02c185a 100644
--- a/tests/layouts/valid-18.layout
+++ b/tests/layouts/valid-18.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "some line breaks
and mis­ce­llaneous ignora‌bles\n",
   "attributes" : [
     {
@@ -7,5 +23,698 @@
       "value" : 7
     }
   ],
-  "font" : "Cantarell 11"
-}
+  "font" : "Cantarell 11",
+  "output" : {
+    "is-wrapped" : true,
+    "is-ellipsized" : false,
+    "width" : 295936,
+    "height" : 62464,
+    "log-attrs" : [
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+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
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+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
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+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
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+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
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+      },
+      {
+        "start-index" : 58,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-19.layout b/tests/layouts/valid-19.layout
index 32ad1283..02b07bf4 100644
--- a/tests/layouts/valid-19.layout
+++ b/tests/layouts/valid-19.layout
@@ -1,5 +1,584 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : " a⃠ 😊︎ 😊️ 🇩🇪 ✊ ✋🏾 0 # 🏴󠁵󠁳󠁣󠁡󠁿 ©\n",
-  "attributes" : [],
-  "font" : "Cantarell 11"
-}
+  "font" : "Cantarell 11",
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 250880,
+    "height" : 43008,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {      },
+      {      },
+      {      },
+      {      },
+      {      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 74,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 6,
+            "text" : " a⃠ ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 268443872,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              }
+            ]
+          },
+          {
+            "offset" : 6,
+            "length" : 8,
+            "text" : "😊︎ ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 5867,
+                "width" : 15360,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 3,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 7
+              }
+            ]
+          },
+          {
+            "offset" : 14,
+            "length" : 7,
+            "text" : "😊️",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 5867,
+                "width" : 15360,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          },
+          {
+            "offset" : 21,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 22,
+            "length" : 8,
+            "text" : "🇩🇪",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Raqq 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 268562921,
+                "width" : 23552,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268562922,
+                "width" : 23552,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          },
+          {
+            "offset" : 30,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 31,
+            "length" : 3,
+            "text" : "✊",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Raqq 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 268445450,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 34,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 35,
+            "length" : 7,
+            "text" : "✋🏾",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Raqq 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 268445451,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268563454,
+                "width" : 23552,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              }
+            ]
+          },
+          {
+            "offset" : 42,
+            "length" : 5,
+            "text" : " 0 # ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 964,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 1070,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          },
+          {
+            "offset" : 47,
+            "length" : 24,
+            "text" : "🏴󠁵󠁳󠁣󠁡󠁿",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Raqq 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 268563444,
+                "width" : 23552,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 12
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 16
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 20
+              }
+            ]
+          },
+          {
+            "offset" : 71,
+            "length" : 3,
+            "text" : " ©",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 1182,
+                "width" : 13312,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 75,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-2.layout b/tests/layouts/valid-2.layout
index 303b2b67..30f062b0 100644
--- a/tests/layouts/valid-2.layout
+++ b/tests/layouts/valid-2.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "test the blue drink after dinner\n",
   "attributes" : [
     {
@@ -14,5 +30,517 @@
       "value" : "single"
     }
   ],
-  "font" : "Cantarell 11"
-}
+  "font" : "Cantarell 11",
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 200704,
+    "height" : 37888,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
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+        "length" : 32,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
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+            "length" : 9,
+            "text" : "test the ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
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+                "is-cluster-start" : true,
+                "log-cluster" : 0
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+              {
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+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              }
+            ]
+          },
+          {
+            "offset" : 9,
+            "length" : 4,
+            "text" : "blue",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell Oblique 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
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+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
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+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
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+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
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+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              }
+            ]
+          },
+          {
+            "offset" : 13,
+            "length" : 7,
+            "text" : " drink ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
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+                "width" : 3072,
+                "is-cluster-start" : true,
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+              },
+              {
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+                "width" : 8192,
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+                "log-cluster" : 1
+              },
+              {
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+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
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+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
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+                "width" : 8192,
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+                "log-cluster" : 4
+              },
+              {
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+              },
+              {
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+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              }
+            ]
+          },
+          {
+            "offset" : 20,
+            "length" : 5,
+            "text" : "after",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 20,
+                "end" : 25,
+                "type" : "underline",
+                "value" : "single"
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 311,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
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+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
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+                "width" : 8192,
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+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 409,
+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          },
+          {
+            "offset" : 25,
+            "length" : 7,
+            "text" : " dinner",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 280,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 360,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 360,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 409,
+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 33,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-20.layout b/tests/layouts/valid-20.layout
index bde84b6f..4f799fd9 100644
--- a/tests/layouts/valid-20.layout
+++ b/tests/layouts/valid-20.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "abcdef\n",
   "attributes" : [
     {
@@ -18,5 +34,176 @@
       "value" : "south"
     }
   ],
-  "font" : "Cantarell 11"
-}
+  "font" : "Cantarell 11",
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 76800,
+    "height" : 44032,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 6,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 3,
+            "text" : "abc",
+            "bidi-level" : 0,
+            "gravity" : "east",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell Rotated-Left 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "end" : 3,
+                "type" : "gravity",
+                "value" : "east"
+              },
+              {
+                "end" : 3,
+                "type" : "gravity-hint",
+                "value" : "strong"
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 244,
+                "width" : 18432,
+                "x-offset" : 33196,
+                "y-offset" : 3844,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 272,
+                "width" : 18432,
+                "x-offset" : 33196,
+                "y-offset" : 4280,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 273,
+                "width" : 18432,
+                "x-offset" : 33196,
+                "y-offset" : 3506,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              }
+            ]
+          },
+          {
+            "offset" : 3,
+            "length" : 3,
+            "text" : "def",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 3,
+                "end" : 6,
+                "type" : "gravity",
+                "value" : "south"
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 280,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 311,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 7,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-22.layout b/tests/layouts/valid-22.layout
index be57d26a..e5e5970e 100644
--- a/tests/layouts/valid-22.layout
+++ b/tests/layouts/valid-22.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "e0 = ooo...\n",
   "attributes" : [
     {
@@ -80,5 +96,513 @@
       "value" : "superscript"
     }
   ],
-  "font" : "Cantarell 11"
-}
+  "font" : "Cantarell 11",
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 49152,
+    "height" : 41090,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 11,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 1,
+            "text" : "e",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 1,
+            "length" : 1,
+            "text" : "0",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell Oblique 7.1484375",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 1,
+                "end" : 2,
+                "type" : "font-scale",
+                "value" : "subscript"
+              },
+              {
+                "start" : 1,
+                "end" : 2,
+                "type" : "baseline-shift",
+                "value" : "subscript"
+              }
+            ],
+            "y-offset" : -3274,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
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+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 2,
+            "length" : 4,
+            "text" : " = o",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
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+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 1147,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
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+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              }
+            ]
+          },
+          {
+            "offset" : 6,
+            "length" : 1,
+            "text" : "o",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 7.1484375",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              }
+            ],
+            "y-offset" : 5542,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
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+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 7,
+            "length" : 1,
+            "text" : "o",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 4.646484375",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              }
+            ],
+            "y-offset" : 9144,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 370,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 8,
+            "length" : 1,
+            "text" : ".",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 3.0205078125",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 8,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 8,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              }
+            ],
+            "y-offset" : 11485,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1058,
+                "width" : 1024,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 9,
+            "length" : 1,
+            "text" : ".",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 1.962890625",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 8,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 8,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 9,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 9,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              }
+            ],
+            "y-offset" : 13007,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1058,
+                "width" : 1024,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 10,
+            "length" : 1,
+            "text" : ".",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 1.2763671875",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 6,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 7,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 8,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 8,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 9,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 9,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              },
+              {
+                "start" : 10,
+                "end" : 11,
+                "type" : "font-scale",
+                "value" : "superscript"
+              },
+              {
+                "start" : 10,
+                "end" : 11,
+                "type" : "baseline-shift",
+                "value" : "superscript"
+              }
+            ],
+            "y-offset" : 13996,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1058,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 12,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-3.layout b/tests/layouts/valid-3.layout
index ef1b1917..a40e605e 100644
--- a/tests/layouts/valid-3.layout
+++ b/tests/layouts/valid-3.layout
@@ -1,5 +1,181 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "ABC😀️D\n",
-  "attributes" : [],
-  "font" : "Cantarell 11"
-}
+  "font" : "Cantarell 11",
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 53248,
+    "height" : 38912,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 11,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 3,
+            "text" : "ABC",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 29,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 30,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              }
+            ]
+          },
+          {
+            "offset" : 3,
+            "length" : 7,
+            "text" : "😀️",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 5857,
+                "width" : 15360,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          },
+          {
+            "offset" : 10,
+            "length" : 1,
+            "text" : "D",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 37,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 12,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-4.layout b/tests/layouts/valid-4.layout
index 5504107d..a57f6d63 100644
--- a/tests/layouts/valid-4.layout
+++ b/tests/layouts/valid-4.layout
@@ -1,6 +1,1889 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "This paragraph should ac­tual­ly have multiple lines, unlike all the other wannabe äöü pa­ra­graph tests in this ugh test-case. Grow some lines!\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
-  "width" : 198656
-}
+  "width" : 198656,
+  "output" : {
+    "is-wrapped" : true,
+    "is-ellipsized" : false,
+    "width" : 197632,
+    "height" : 111616,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
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diff --git a/tests/layouts/valid-5.layout b/tests/layouts/valid-5.layout
index e5e96b9a..fa68f67c 100644
--- a/tests/layouts/valid-5.layout
+++ b/tests/layouts/valid-5.layout
@@ -1,4 +1,20 @@
 {
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+    "language" : "en-us",
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+      0.0,
+      1.0,
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   "text" : "A test with multiple paragraphs and with no-break attributes, which might trigger a crash.\nIf it doesn't the fix has worked.\n",
   "attributes" : [
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@@ -9,5 +25,1679 @@
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diff --git a/tests/layouts/valid-6.layout b/tests/layouts/valid-6.layout
index 4423d068..c0b31f13 100644
--- a/tests/layouts/valid-6.layout
+++ b/tests/layouts/valid-6.layout
@@ -1,5 +1,369 @@
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+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 26,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 1,
+            "length" : 7,
+            "text" : "0️⃣",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 19,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 268435455,
+                "width" : 0,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 268443875,
+                "width" : 17408,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              }
+            ]
+          },
+          {
+            "offset" : 8,
+            "length" : 18,
+            "text" : " Keycap Digit Zero",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 100,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 473,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 273,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 406,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 7
+              },
+              {
+                "glyph" : 37,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 312,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 10
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 11
+              },
+              {
+                "glyph" : 430,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 12
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 13
+              },
+              {
+                "glyph" : 239,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 14
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 15
+              },
+              {
+                "glyph" : 409,
+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 16
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 17
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 27,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-7.layout b/tests/layouts/valid-7.layout
index b49484c6..882e67c8 100644
--- a/tests/layouts/valid-7.layout
+++ b/tests/layouts/valid-7.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "This is a test of the automatic emergency brake!\n",
   "attributes" : [
     {
@@ -17,5 +33,555 @@
   "font" : "Cantarell 11",
   "ellipsize" : "middle",
   "width" : 204800,
-  "indent" : 51200
-}
+  "indent" : 51200,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : true,
+    "width" : 153600,
+    "height" : 37888,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 48,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 12,
+            "text" : "This is a te",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 187,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 319,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 417,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 417,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 7
+              },
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 430,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 10
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 11
+              }
+            ]
+          },
+          {
+            "offset" : 12,
+            "length" : 26,
+            "text" : "st of the automatic emerge",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "common",
+            "font" : "Cantarell 11",
+            "flags" : 2,
+            "extra-attributes" : [
+              {
+                "end" : 2147483647,
+                "type" : "fallback",
+                "value" : false
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1062,
+                "width" : 16384,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 38,
+            "length" : 3,
+            "text" : "ncy",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "extra-attributes" : [
+              {
+                "start" : 22,
+                "end" : 41,
+                "type" : "foreground",
+                "value" : "#00000000ffff"
+              },
+              {
+                "start" : 22,
+                "end" : 41,
+                "type" : "underline",
+                "value" : "single"
+              }
+            ],
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 360,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 273,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 473,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              }
+            ]
+          },
+          {
+            "offset" : 41,
+            "length" : 7,
+            "text" : " brake!",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 272,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 409,
+                "width" : 6144,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 244,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 345,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              },
+              {
+                "glyph" : 1063,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 49,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-8.layout b/tests/layouts/valid-8.layout
index 063ec370..ea42ae7a 100644
--- a/tests/layouts/valid-8.layout
+++ b/tests/layouts/valid-8.layout
@@ -1,8 +1,362 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "Hello שלום Γειά σας\n",
-  "attributes" : [],
   "font" : "Cantarell 11",
   "auto-dir" : false,
   "alignment" : "center",
-  "spacing" : 51200
-}
+  "spacing" : 51200,
+  "output" : {
+    "is-wrapped" : false,
+    "is-ellipsized" : false,
+    "width" : 134144,
+    "height" : 90112,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
+    ],
+    "lines" : [
+      {
+        "start-index" : 0,
+        "length" : 30,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
+          {
+            "offset" : 0,
+            "length" : 6,
+            "text" : "Hello ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 76,
+                "width" : 11264,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 287,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 1
+              },
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 349,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 3
+              },
+              {
+                "glyph" : 370,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 5
+              }
+            ]
+          },
+          {
+            "offset" : 6,
+            "length" : 8,
+            "text" : "שלום",
+            "bidi-level" : 1,
+            "gravity" : "south",
+            "language" : "he",
+            "script" : "hebrew",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 1332,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1324,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 1331,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 1344,
+                "width" : 10240,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 14,
+            "length" : 1,
+            "text" : " ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "he",
+            "script" : "hebrew",
+            "font" : "DejaVu Sans 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 3,
+                "width" : 5120,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              }
+            ]
+          },
+          {
+            "offset" : 15,
+            "length" : 15,
+            "text" : "Γειά σας",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "el",
+            "script" : "greek",
+            "font" : "Cantarell 11",
+            "flags" : 0,
+            "y-offset" : 0,
+            "start-x-offset" : 0,
+            "end-x-offset" : 0,
+            "glyphs" : [
+              {
+                "glyph" : 677,
+                "width" : 8192,
+                "is-cluster-start" : true,
+                "log-cluster" : 0
+              },
+              {
+                "glyph" : 808,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 2
+              },
+              {
+                "glyph" : 812,
+                "width" : 4096,
+                "is-cluster-start" : true,
+                "log-cluster" : 4
+              },
+              {
+                "glyph" : 837,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 6
+              },
+              {
+                "glyph" : 1109,
+                "width" : 3072,
+                "is-cluster-start" : true,
+                "log-cluster" : 8
+              },
+              {
+                "glyph" : 822,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 9
+              },
+              {
+                "glyph" : 804,
+                "width" : 9216,
+                "is-cluster-start" : true,
+                "log-cluster" : 11
+              },
+              {
+                "glyph" : 821,
+                "width" : 7168,
+                "is-cluster-start" : true,
+                "log-cluster" : 13
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "start-index" : 31,
+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/layouts/valid-9.layout b/tests/layouts/valid-9.layout
index e3dfa57b..e833808e 100644
--- a/tests/layouts/valid-9.layout
+++ b/tests/layouts/valid-9.layout
@@ -1,4 +1,20 @@
 {
+  "context" : {
+    "font" : "serif 12",
+    "language" : "en-us",
+    "base-gravity" : "south",
+    "gravity-hint" : "natural",
+    "base-dir" : "weak-ltr",
+    "round-glyph-positions" : true,
+    "transform" : [
+      1.0,
+      0.0,
+      0.0,
+      1.0,
+      0.0,
+      0.0
+    ]
+  },
   "text" : "Hello שלום Γειά σας\n",
   "attributes" : [
     {
@@ -8,5 +24,434 @@
     }
   ],
   "font" : "Cantarell 11",
-  "width" : 102400
-}
+  "width" : 102400,
+  "output" : {
+    "is-wrapped" : true,
+    "is-ellipsized" : false,
+    "width" : 71392,
+    "height" : 93184,
+    "log-attrs" : [
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "sentence-boundary" : true,
+        "sentence-start" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "backspace-deletes-character" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "backspace-deletes-character" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "expandable-space" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "char-break" : true,
+        "cursor-position" : true,
+        "word-start" : true,
+        "word-boundary" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "cursor-position" : true,
+        "break-inserts-hyphen" : true
+      },
+      {
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "word-end" : true,
+        "sentence-end" : true,
+        "word-boundary" : true
+      },
+      {
+        "line-break" : true,
+        "mandatory-break" : true,
+        "char-break" : true,
+        "white" : true,
+        "cursor-position" : true,
+        "sentence-boundary" : true,
+        "backspace-deletes-character" : true,
+        "word-boundary" : true
+      }
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+    "lines" : [
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+        "length" : 6,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : [
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+            "text" : "Hello ",
+            "bidi-level" : 0,
+            "gravity" : "south",
+            "language" : "en-us",
+            "script" : "latin",
+            "font" : "Cantarell 11",
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+                "type" : "letter-spacing",
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+            "glyphs" : [
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+        "paragraph-start" : false,
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+        "runs" : [
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+        "length" : 0,
+        "paragraph-start" : true,
+        "direction" : "ltr",
+        "runs" : []
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/tests/test-common.c b/tests/test-common.c
index 3821a450..12b22cb4 100644
--- a/tests/test-common.c
+++ b/tests/test-common.c
@@ -82,6 +82,70 @@ done:
   return diff;
 }
 
+char *
+diff_bytes (GBytes  *b1,
+            GBytes  *b2,
+            GError **error)
+{
+  const char *command[] = { "diff", "-u", "-i", NULL, NULL, NULL };
+  char *diff, *tmpfile, *tmpfile2;
+  int fd;
+  const char *text;
+  gsize len;
+
+  /* write the text buffer to a temporary file */
+  fd = g_file_open_tmp (NULL, &tmpfile, error);
+  if (fd < 0)
+    return NULL;
+
+  text = (const char *) g_bytes_get_data (b1, &len);
+  if (write (fd, text, len) != (int) len)
+    {
+      close (fd);
+      g_set_error (error,
+                   G_FILE_ERROR, G_FILE_ERROR_FAILED,
+                   "Could not write data to temporary file '%s'", tmpfile);
+      goto done;
+    }
+  close (fd);
+
+  fd = g_file_open_tmp (NULL, &tmpfile2, error);
+  if (fd < 0)
+    return NULL;
+
+  text = (const char *) g_bytes_get_data (b2, &len);
+  if (write (fd, text, len) != (int) len)
+    {
+      close (fd);
+      g_set_error (error,
+                   G_FILE_ERROR, G_FILE_ERROR_FAILED,
+                   "Could not write data to temporary file '%s'", tmpfile2);
+      goto done;
+    }
+  close (fd);
+
+  command[3] = tmpfile;
+  command[4] = tmpfile2;
+
+  /* run diff command */
+  g_spawn_sync (NULL,
+                (char **) command,
+                NULL,
+                G_SPAWN_SEARCH_PATH,
+                NULL, NULL,
+                &diff,
+                NULL, NULL,
+                error);
+
+done:
+  unlink (tmpfile);
+  g_free (tmpfile);
+  unlink (tmpfile2);
+  g_free (tmpfile2);
+
+  return diff;
+}
+
 gboolean
 file_has_prefix (const char  *filename,
                  const char  *str,
diff --git a/tests/test-common.h b/tests/test-common.h
index 86320236..6fe96133 100644
--- a/tests/test-common.h
+++ b/tests/test-common.h
@@ -6,6 +6,10 @@ char * diff_with_file (const char  *file,
                        gssize       len,
                        GError     **error);
 
+char * diff_bytes (GBytes  *b1,
+                   GBytes  *b2,
+                   GError **error);
+
 gboolean file_has_prefix (const char  *file,
                           const char  *str,
                           GError     **error);
diff --git a/tests/test-layout.c b/tests/test-layout.c
index f4b36c77..b664af5d 100644
--- a/tests/test-layout.c
+++ b/tests/test-layout.c
@@ -36,194 +36,9 @@ static PangoContext *context;
 
 static gboolean opt_show_font;
 
-static const gchar *
-enum_value_nick (GType type, gint value)
+static GBytes *
+test_bytes (GBytes *orig)
 {
-  GEnumClass *eclass;
-  GEnumValue *ev;
-
-  eclass = g_type_class_ref (type);
-  ev = g_enum_get_value (eclass, value);
-  g_type_class_unref (eclass);
-
-  if (ev)
-    return ev->value_nick;
-  else
-    return "?";
-}
-
-static const gchar *
-direction_name (PangoDirection dir)
-{
-  return enum_value_nick (PANGO_TYPE_DIRECTION, dir);
-}
-
-static const gchar *
-gravity_name (PangoGravity gravity)
-{
-  return enum_value_nick (PANGO_TYPE_GRAVITY, gravity);
-}
-
-static const gchar *
-script_name (PangoScript script)
-{
-  return enum_value_nick (PANGO_TYPE_SCRIPT, script);
-}
-
-static gchar *
-font_name (PangoFont *font)
-{
-  PangoFontDescription *desc;
-  gchar *name;
-
-  desc = pango_font_describe (font);
-  name = pango_font_description_to_string (desc);
-  pango_font_description_free (desc);
-
-  return name;
-}
-
-static void
-dump_lines (PangoLayout *layout, GString *string)
-{
-  PangoLayoutIter *iter;
-  const gchar *text;
-  gint index, index2;
-  gboolean has_more;
-  gchar *char_str;
-  gint i;
-  PangoLayoutLine *line;
-
-  text = pango_layout_get_text (layout);
-  iter = pango_layout_get_iter (layout);
-
-  has_more = TRUE;
-  index = pango_layout_iter_get_index (iter);
-  index2 = 0;
-  i = 0;
-  while (has_more)
-    {
-      line = pango_layout_iter_get_line (iter);
-      has_more = pango_layout_iter_next_line (iter);
-      i++;
-
-      if (has_more)
-        {
-          index2 = pango_layout_iter_get_index (iter);
-          char_str = g_strndup (text + index, index2 - index);
-        }
-      else
-        {
-          char_str = g_strdup (text + index);
-        }
-
-      g_string_append_printf (string, "i=%d, index=%d, paragraph-start=%d, dir=%s '%s'\n",
-                              i, index, line->is_paragraph_start, direction_name (line->resolved_dir),
-                              char_str);
-      g_free (char_str);
-
-      index = index2;
-    }
-  pango_layout_iter_free (iter);
-}
-
-#define ANALYSIS_FLAGS (PANGO_ANALYSIS_FLAG_CENTERED_BASELINE | \
-                        PANGO_ANALYSIS_FLAG_IS_ELLIPSIS | \
-                        PANGO_ANALYSIS_FLAG_NEED_HYPHEN)
-
-static void
-dump_runs (PangoLayout *layout, GString *string)
-{
-  PangoLayoutIter *iter;
-  PangoLayoutRun *run;
-  PangoItem *item;
-  const gchar *text;
-  gint index;
-  gboolean has_more;
-  gchar *char_str;
-  gint i;
-  gchar *font = 0;
-
-  text = pango_layout_get_text (layout);
-  iter = pango_layout_get_iter (layout);
-
-  has_more = TRUE;
-  i = 0;
-  while (has_more)
-    {
-      run = pango_layout_iter_get_run (iter);
-      index = pango_layout_iter_get_index (iter);
-      has_more = pango_layout_iter_next_run (iter);
-      i++;
-
-      if (run)
-        {
-          item = ((PangoGlyphItem*)run)->item;
-          char_str = g_strndup (text + item->offset, item->length);
-          font = font_name (item->analysis.font);
-          g_string_append_printf (string, "i=%d, index=%d, chars=%d, level=%d, gravity=%s, flags=%d, font=%s, script=%s, language=%s, '%s'\n",
-                                  i, index, item->num_chars, item->analysis.level,
-                                  gravity_name (item->analysis.gravity),
-                                  item->analysis.flags & ANALYSIS_FLAGS,
-                                  opt_show_font ? font : "OMITTED", /* for some reason, this fails on build.gnome.org, so leave it out */
-                                  script_name (item->analysis.script),
-                                  pango_language_to_string (item->analysis.language),
-                                  char_str);
-          print_attributes (item->analysis.extra_attrs, string);
-          g_free (font);
-          g_free (char_str);
-        }
-      else
-        {
-          g_string_append_printf (string, "i=%d, index=%d, no run, line end\n",
-                                  i, index);
-        }
-    }
-  pango_layout_iter_free (iter);
-}
-
-static void
-dump_directions (PangoLayout *layout, GString *string)
-{
-  const char *text, *p;
-
-  text = pango_layout_get_text (layout);
-  for (p = text; *p; p = g_utf8_next_char (p))
-    {
-      g_string_append_printf (string, "%d ", pango_layout_get_direction (layout, p - text));
-    }
-  g_string_append (string, "\n");
-}
-
-static void
-dump_cursor_positions (PangoLayout *layout, GString *string)
-{
-  const char *text;
-  int index, trailing;
-
-  text = pango_layout_get_text (layout);
-
-  index = 0;
-  trailing = 0;
-
-  while (index < G_MAXINT)
-    {
-      g_string_append_printf (string, "%d(%d) ", index, trailing);
-
-      while (trailing--)
-        index = g_utf8_next_char (text + index) - text;
-
-      pango_layout_move_cursor_visually (layout, TRUE, index, 0, 1, &index, &trailing);
-    }
-
-  g_string_append (string, "\n");
-}
-
-static void
-test_file (const char *filename, GString *string)
-{
-  char *contents;
-  gsize  length;
   GBytes *bytes;
   GError *error = NULL;
   PangoLayout *layout;
@@ -231,76 +46,29 @@ test_file (const char *filename, GString *string)
   if (context == NULL)
     context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
 
-  g_file_get_contents (filename, &contents, &length, &error);
-  g_assert_no_error (error);
-
-  bytes = g_bytes_new_take (contents, length);
-
-  layout = pango_layout_deserialize (context, bytes, PANGO_LAYOUT_DESERIALIZE_DEFAULT, &error);
+  layout = pango_layout_deserialize (context, orig, PANGO_LAYOUT_DESERIALIZE_CONTEXT, &error);
   g_assert_no_error (error);
 
-  g_bytes_unref (bytes);
-
-  /* generate the dumps */
-  g_string_append (string, pango_layout_get_text (layout));
-
-  g_string_append (string, "\n--- parameters\n\n");
-
-  g_string_append_printf (string, "wrapped: %d\n", pango_layout_is_wrapped (layout));
-  g_string_append_printf (string, "ellipsized: %d\n", pango_layout_is_ellipsized (layout));
-  g_string_append_printf (string, "lines: %d\n", pango_layout_get_line_count (layout));
-  if (pango_layout_get_width (layout) > 0)
-    g_string_append_printf (string, "width: %d\n", pango_layout_get_width (layout));
-  if (pango_layout_get_height (layout) > 0)
-    g_string_append_printf (string, "height: %d\n", pango_layout_get_height (layout));
-  if (pango_layout_get_indent (layout) != 0)
-    g_string_append_printf (string, "indent: %d\n", pango_layout_get_indent (layout));
-
-  g_string_append (string, "\n--- attributes\n\n");
-  print_attr_list (pango_layout_get_attributes (layout), string);
-
-  g_string_append (string, "\n--- directions\n\n");
-  dump_directions (layout, string);
-
-  g_string_append (string, "\n--- cursor positions\n\n");
-  dump_cursor_positions (layout, string);
-
-  g_string_append (string, "\n--- lines\n\n");
-  dump_lines (layout, string);
-
-  g_string_append (string, "\n--- runs\n\n");
-  dump_runs (layout, string);
+  bytes = pango_layout_serialize (layout, PANGO_LAYOUT_SERIALIZE_CONTEXT | PANGO_LAYOUT_SERIALIZE_OUTPUT);
 
   g_object_unref (layout);
-}
-
-static gchar *
-get_expected_filename (const char *filename)
-{
-  char *f, *p, *expected;
 
-  f = g_strdup (filename);
-  p = strstr (f, ".layout");
-  if (p)
-    *p = 0;
-  expected = g_strconcat (f, ".expected", NULL);
-
-  g_free (f);
-
-  return expected;
+  return bytes;
 }
 
 static void
 test_layout (gconstpointer d)
 {
   const char *filename = d;
-  char *expected_file;
   GError *error = NULL;
-  GString *dump;
   char *diff;
   PangoFontFamily **families;
   int n_families;
   gboolean found_cantarell;
+  GBytes *bytes;
+  char *contents;
+  gsize length;
+  GBytes *orig;
 
   char *old_locale = g_strdup (setlocale (LC_ALL, NULL));
   setlocale (LC_ALL, "en_US.UTF-8");
@@ -330,22 +98,25 @@ test_layout (gconstpointer d)
 
   if (!found_cantarell)
     {
-      char *msg = g_strdup_printf ("Cantarell font not available, skipping itemization %s", filename);
+      char *msg = g_strdup_printf ("Cantarell font not available, skipping layout %s", filename);
       g_test_skip (msg);
       g_free (msg);
       g_free (old_locale);
       return;
     }
 
-  expected_file = get_expected_filename (filename);
-
-  dump = g_string_sized_new (0);
+  g_file_get_contents (filename, &contents, &length, &error);
+  g_assert_no_error (error);
+  orig = g_bytes_new_take (contents, length);
 
-  test_file (filename, dump);
+  bytes = test_bytes (orig);
 
-  diff = diff_with_file (expected_file, dump->str, dump->len, &error);
+  diff = diff_bytes (bytes, orig, &error);
   g_assert_no_error (error);
 
+  g_bytes_unref (bytes);
+  g_bytes_unref (orig);
+
   setlocale (LC_ALL, old_locale);
   g_free (old_locale);
 
@@ -365,8 +136,6 @@ test_layout (gconstpointer d)
     }
 
   g_free (diff);
-  g_string_free (dump, TRUE);
-  g_free (expected_file);
 }
 
 int
@@ -400,12 +169,21 @@ main (int argc, char *argv[])
   /* allow to easily generate expected output for new test cases */
   if (argc > 1 && argv[1][0] != '-')
     {
-      GString *string;
+      char *contents;
+      gsize length;
+      GError *error = NULL;
+      GBytes *orig;
+      GBytes *bytes;
+
+      g_file_get_contents (argv[1], &contents, &length, &error);
+      g_assert_no_error (error);
+      orig = g_bytes_new_take (contents, length);
+      bytes = test_bytes (orig);
+
+      g_print ("%s", (const char *)g_bytes_get_data (bytes, NULL));
 
-      string = g_string_sized_new (0);
-      test_file (argv[1], string);
-      g_print ("%s", string->str);
-      g_string_free (string, TRUE);
+      g_bytes_unref (bytes);
+      g_bytes_unref (orig);
 
       return 0;
     }