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harfbuzz/test/shaping
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Khaled Hosny 7686ff854b
[ot] Keep substituted Default_Ignorables (#2886) 
Don’t replace Default_Ignorables with zero-width space if they are
substituted or multiplied, not just when ligated.

After this change, HarfBuzz output matches that of Uniscribe and
CoreText for the new tests.

Fixes https://github.com/harfbuzz/harfbuzz/issues/2883
 		2021-03-04 13:09:32 -08:00
..
data [ot] Keep substituted Default_Ignorables (#2886) 2021-03-04 13:09:32 -08:00
texts/in-house [tests] I’m an idiot 2020-06-18 02:29:12 +02:00
Makefile.am Revert "Remove autotools build support" 2020-08-11 23:51:59 +04:30
README.md [use] Prohibit visually ambiguous vowel sequences 2018-10-23 02:25:08 -07:00
hb-diff minor, use sys.exit print shorthand 2020-05-28 23:34:37 +04:30
hb-diff-colorize Remove python2 support from tests/utils scripts 2020-02-19 16:17:45 +03:30
hb-diff-filter-failures Remove python2 support from tests/utils scripts 2020-02-19 16:17:45 +03:30
hb-diff-stat Remove python2 support from tests/utils scripts 2020-02-19 16:17:45 +03:30
hb-unicode-decode Remove python2 support from tests/utils scripts 2020-02-19 16:17:45 +03:30
hb-unicode-encode Remove python2 support from tests/utils scripts 2020-02-19 16:17:45 +03:30
hb-unicode-prettyname Remove python2 support from tests/utils scripts 2020-02-19 16:17:45 +03:30
hb_test_tools.py minor, use sys.exit print shorthand 2020-05-28 23:34:37 +04:30
meson.build [meson] Make compatbile with 0.47.0 2020-08-13 18:28:42 +04:30
record-test.sh Remove python2 support from tests/utils scripts 2020-02-19 16:17:45 +03:30
run-tests.py [aat] Improve unsafe-to-break logic 2021-02-19 16:23:22 -07:00

README.md

Adding tests

You can test shaping of a unicode sequence against a font like this:

$ ./hb-unicode-encode 41 42 43 627 | ../../util/hb-shape font.ttf

assuming an in-tree build. The 41 42 43 627 here is a sequence of Unicode codepoints: U+0041,0042,0043,0627. When you are happy with the shape results, you can use the record-test.sh script to add this to the test suite. record-test.sh requires pyftsubset to be installed. You can get pyftsubset by installing FontTools from https://github.com/behdad/fonttools.

To use record-test.sh, just put it right before the hb-shape invocation:

$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh ../../util/hb-shape font.ttf

what this does is:

  • Subset the font for the sequence of Unicode characters requested,
  • Compare the hb-shape output of the original font versus the subset font for the input sequence,
  • If the outputs differ, perhaps it is because the font does not have glyph names; it then compares the output of hb-view for both fonts.
  • If the outputs differ, recording fails. Otherwise, it will move the subset font file into data/in-house/fonts and name it after its hash, and print out the test case input, which you can then redirect to an existing or new test file in data/in-house/tests using -o, e.g.:
$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh -o data/in-house/tests/test-name.test ../../util/hb-shape font.ttf

If you created a new test file, add it to data/in-house/Makefile.sources so it is run. Check that make check does indeed run it, and that the test passes. When everything looks good, git add the new font as well as the new test file if you created any. You can see what new files are there by running git status data/in-house. And commit!

Note! Please only add tests using Open Source fonts, preferably under OFL or similar license.