1 files changed, 69 insertions, 3 deletions

diff --git a/test/lisp/character-fold-tests.el b/test/lisp/character-fold-tests.el
index 2b1a15c9e76..c0568625649 100644
--- a/test/lisp/character-fold-tests.el
+++ b/test/lisp/character-fold-tests.el
@@ -37,13 +37,13 @@
 
 
 (ert-deftest character-fold--test-consistency ()
-  (dotimes (n 100)
+  (dotimes (n 30)
     (let ((w (character-fold--random-word n)))
       ;; A folded string should always match the original string.
       (character-fold--test-search-with-contents w w))))
 
 (ert-deftest character-fold--test-lax-whitespace ()
-  (dotimes (n 100)
+  (dotimes (n 40)
     (let ((w1 (character-fold--random-word n))
           (w2 (character-fold--random-word n))
           (search-spaces-regexp "\\s-+"))
@@ -52,7 +52,73 @@
        (concat w1 " " w2))
       (character-fold--test-search-with-contents
        (concat w1 "\s\n\s\t\f\t\n\r\t" w2)
-       (concat w1 (make-string 90 ?\s) w2)))))
+       (concat w1 (make-string 10 ?\s) w2)))))
+
+(defun character-fold--test-match-exactly (string &rest strings-to-match)
+  (let ((re (concat "\\`" (character-fold-to-regexp string) "\\'")))
+    (dolist (it strings-to-match)
+      (should (string-match re it)))
+    ;; Case folding
+    (let ((case-fold-search t))
+      (dolist (it strings-to-match)
+        (should (string-match (upcase re) (downcase it)))
+        (should (string-match (downcase re) (upcase it)))))))
+
+(ert-deftest character-fold--test-some-defaults ()
+  (dolist (it '(("ffl" . "ffl") ("ffi" . "ffi")
+                ("fi" . "fi") ("ff" . "ff")
+                ("ä" . "ä")))
+    (character-fold--test-search-with-contents (cdr it) (car it))
+    (let ((multi (char-table-extra-slot character-fold-table 0))
+          (character-fold-table (make-char-table 'character-fold-table)))
+      (set-char-table-extra-slot character-fold-table 0 multi)
+      (character-fold--test-match-exactly (car it) (cdr it)))))
+
+(ert-deftest character-fold--test-fold-to-regexp ()
+  (let ((character-fold-table (make-char-table 'character-fold-table))
+        (multi  (make-char-table 'character-fold-table)))
+    (set-char-table-extra-slot character-fold-table 0 multi)
+    (aset character-fold-table ?a "xx")
+    (aset character-fold-table ?1 "44")
+    (aset character-fold-table ?\s "-!-")
+    (character-fold--test-match-exactly "a1a1" "xx44xx44")
+    (character-fold--test-match-exactly "a1  a 1" "xx44-!--!-xx-!-44")
+    (aset multi ?a '(("1" . "99")
+                     ("2" . "88")
+                     ("12" . "77")))
+    (character-fold--test-match-exactly "a" "xx")
+    (character-fold--test-match-exactly "a1" "xx44" "99")
+    (character-fold--test-match-exactly "a12" "77" "xx442" "992")
+    (character-fold--test-match-exactly "a2" "88")
+    (aset multi ?1 '(("2" . "yy")))
+    (character-fold--test-match-exactly "a1" "xx44" "99")
+    (character-fold--test-match-exactly "a12" "77" "xx442" "992")
+    ;; Support for this case is disabled.  See function definition or:
+    ;; https://lists.gnu.org/archive/html/emacs-devel/2015-11/msg02562.html
+    ;; (character-fold--test-match-exactly "a12" "xxyy")
+    ))
+
+(ert-deftest character-fold--speed-test ()
+  (dolist (string (append '("tty-set-up-initial-frame-face"
+                            "tty-set-up-initial-frame-face-frame-faceframe-faceframe-faceframe-face")
+                          (mapcar #'character-fold--random-word '(10 50 100
+                                                                     50 100))))
+    (message "Testing %s" string)
+    ;; Make sure we didn't just fallback on the trivial search.
+    (should-not (string= (regexp-quote string)
+                         (character-fold-to-regexp string)))
+    (with-temp-buffer
+      (save-excursion (insert string))
+      (let ((time (time-to-seconds (current-time))))
+        ;; Our initial implementation of case-folding in char-folding
+        ;; created a lot of redundant paths in the regexp. Because of
+        ;; that, if a really long string "almost" matches, the regexp
+        ;; engine took a long time to realize that it doesn't match.
+        (should-not (character-fold-search-forward (concat string "c") nil 'noerror))
+        ;; Ensure it took less than a second.
+        (should (< (- (time-to-seconds (current-time))
+                      time)
+                   1))))))
 
 (provide 'character-fold-tests)
 ;;; character-fold-tests.el ends here