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[test] Add README about how to add shaping tests

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Behdad Esfahbod 2016-02-23 13:47:16 +09:00
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commit 6a09d7e34b
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test/shaping/Makefile.am
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@ -14,6 +14,7 @@ manifests:
@$(srcdir)/hb-manifest-update "$(srcdir)/texts" "$(srcdir)/fonts" "$(srcdir)/tests"
EXTRA_DIST += \
README.md \
hb-diff \
hb-diff-colorize \
hb-diff-filter-failures \

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test/shaping/README.md Normal file
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@ -0,0 +1,37 @@
Adding tests
============
You can test shaping of a unicode sequence against a font like this:
```sh
$ ./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:
```sh
$ ./hb-unicode-encode 41 42 43 627 | ./record-it.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 `fonts/sha1sum` and name it after its hash,
and prints out the test case input, which you can then redirect to
an existing or new test file in `tests`, eg.:
```sh
$ ./hb-unicode-encode 41 42 43 627 | ./record-it.sh ../../util/hb-shape font.ttf >> tests/test-name.test
```
If you created a new test file, add it to Makefile.am so it is run.
Check that `make test` does indeed run it, and that the test passes.
When everything looks good, `git add` the new font as well as new
test file if you created any. You can see what new files are there
by running `git status tests fonts/sha1sum`. And commit!