[tmac]: Work around macOS od (mis-)behavior.

* tmac/tests/latin2_works.sh:
* tmac/tests/latin5_works.sh:
* tmac/tests/latin9_works.sh: Port to work around macOS's apparently
  POSIX non-conforming 'od' command.  Use single-byte octal output
  format instead of "character", and update test expectations
  accordingly.  Apparently gratuitously, macOS also puts more spaces
  after the octal address field when using this output format.

* HACKING: Document, and elaborate upon, this problem.

Also distinguish identical test failure diagnostics.

ANNOUNCE: Remove caveat about automated test failures on macOS.

3 files changed, 22 insertions, 20 deletions

diff --git a/tmac/tests/latin2_works.sh b/tmac/tests/latin2_works.sh
index 144fcfb41..0b1ac84b8 100755
--- a/tmac/tests/latin2_works.sh
+++ b/tmac/tests/latin2_works.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2022 Free Software Foundation, Inc.
+# Copyright (C) 2022-2023 Free Software Foundation, Inc.
 #
 # This file is part of groff.
 #
@@ -43,30 +43,32 @@ input=$(\
 )
 
 output=$(printf "%s\n" "$input" | "$groff" -Tlatin1 -mlatin2 \
-    | LC_ALL=C od -t c)
+    | LC_ALL=C od -t o1)
+printf "%s\n" "$output"
 printf "$output" \
-    | grep -Eq '^0000000 241 242 243 246 251 252 253 254 256 257 +' \
+    | grep -Eq '^0000000 +241 242 243 246 251 252 253 254 256 257 +' \
     || wail "in block 0xA0"
 printf "$output" \
-    | grep -Eq '^0000000 .* 261 262 263 266 271$' \
-    || wail "in block 0xB0"
+    | grep -Eq '^0000000 +.* 261 262 263 266 271$' \
+    || wail "in block 0xB0 (address 0..017)"
 printf "$output" \
-    | grep -Eq '^0000020 272 273 274 275 256 277 +' \
-    || wail "in block 0xB0"
+    | grep -Eq '^0000020 +272 273 274 275 256 277 +' \
+    || wail "in block 0xB0 (address 020..037)"
 printf "$output" \
-    | grep -Eq '^0000020 .* 300 303 305 306 310 312 314 317 +$' \
+    | grep -Eq '^0000020 +.* 300 303 305 306 310 312 314 317 040$' \
     || wail "in block 0xC0"
 printf "$output" \
-    | grep -Eq '^0000040 320 321 322 325 330 331 333 336 +' \
+    | grep -Eq '^0000040 +320 321 322 325 330 331 333 336 +' \
     || wail "in block 0xD0"
 printf "$output" \
-    | grep -Eq '^0000040 .* 340 343 345 346 350 352 354$' \
-    || wail "in block 0xE0"
+    | grep -Eq '^0000040 +.* 340 343 345 346 350 352 354$' \
+    || wail "in block 0xE0 (address 040..057)"
 printf "$output" \
-    | grep -Eq '^0000060 357 +' \
-    || wail "in block 0xE0"
+    | grep -Eq '^0000060 +357 +' \
+    || wail "in block 0xE0 (address 060..077)"
 printf "$output" \
-    | grep -Eq '^0000060 .* 360 361 362 365 370 371 373 376 377 +$' \
+    | grep -Eq \
+        '^0000060 +.* 360 361 362 365 370 371 373 376 377( 012)+$' \
     || wail "in block 0xF0"
 
 test -z "$fail"
diff --git a/tmac/tests/latin5_works.sh b/tmac/tests/latin5_works.sh
index eb33a9dbd..62e1c1111 100755
--- a/tmac/tests/latin5_works.sh
+++ b/tmac/tests/latin5_works.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2022 Free Software Foundation, Inc.
+# Copyright (C) 2022-2023 Free Software Foundation, Inc.
 #
 # This file is part of groff.
 #
@@ -22,9 +22,9 @@ groff="${abs_top_builddir:-.}/test-groff"
 
 input=$(printf '\\[G ab]\\[g ab]\\[u0130]\\[.i]\\[S ac]\\[s ac]')
 output=$(printf "%s\n" "$input" | "$groff" -Tlatin1 -mlatin5 \
-    | LC_ALL=C od -t c)
+    | LC_ALL=C od -t o1)
 printf "%s\n" "$output"
 printf "$output" \
-    | grep -Eq '^0000000 320 360 335 375 336 376 +'
+    | grep -Eq '^0000000 +320 360 335 375 336 376 +'
 
 # vim:set ai et sw=4 ts=4 tw=72:
diff --git a/tmac/tests/latin9_works.sh b/tmac/tests/latin9_works.sh
index 828c31367..ca5e23b28 100755
--- a/tmac/tests/latin9_works.sh
+++ b/tmac/tests/latin9_works.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (C) 2022 Free Software Foundation, Inc.
+# Copyright (C) 2022-2023 Free Software Foundation, Inc.
 #
 # This file is part of groff.
 #
@@ -22,9 +22,9 @@ groff="${abs_top_builddir:-.}/test-groff"
 
 input=$(printf '\\[Eu]\\[vS]\\[vs]\\[vZ]\\[vz]\\[OE]\\[oe]\\[:Y]\n')
 output=$(printf "%s\n" "$input" | "$groff" -Tlatin1 -mlatin9 \
-    | LC_ALL=C od -t c)
+    | LC_ALL=C od -t o1)
 printf "%s\n" "$output"
 printf "$output" \
-    | grep -Eq '^0000000 244 246 250 264 270 274 275 276 +'
+    | grep -Eq '^0000000 +244 246 250 264 270 274 275 276 +'
 
 # vim:set ai et sw=4 ts=4 tw=72: