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Adding tests
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============
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You can test shaping of a unicode sequence against a font like this:
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```sh
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$ ./hb-unicode-encode 41 42 43 627 | ../../util/hb-shape font.ttf
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```
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assuming an in-tree build. The 41 42 43 627 here is a sequence of
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Unicode codepoints: U+0041,0042,0043,0627. When you are happy with
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the shape results, you can use the `record-test.sh` script to add
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this to the test suite. `record-test.sh` requires `pyftsubset` to
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be installed. You can get `pyftsubset` by installing
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FontTools from <https://github.com/behdad/fonttools>.
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To use `record-test.sh`, just put it right before the `hb-shape` invocation:
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```sh
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$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh ../../util/hb-shape font.ttf
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```
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what this does is:
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* Subset the font for the sequence of Unicode characters requested,
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* Compare the `hb-shape` output of the original font versus the subset
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font for the input sequence,
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* If the outputs differ, perhaps it is because the font does not have
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glyph names; it then compares the output of `hb-view` for both fonts.
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* If the outputs differ, recording fails. Otherwise, it will move the
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subset font file into `data/in-house/fonts` and name it after its
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hash, and print out the test case input, which you can then redirect
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to an existing or new test file in `data/in-house/tests` using `-o`,
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e.g.:
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```sh
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$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh -o data/in-house/tests/test-name.test ../../util/hb-shape font.ttf
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```
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If you created a new test file, add it to `data/in-house/Makefile.sources`
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so it is run. Check that `make check` does indeed run it, and that the
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test passes. When everything looks good, `git add` the new font as well
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as the new test file if you created any. You can see what new files are
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there by running `git status data/in-house`. And commit!
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*Note!* Please only add tests using Open Source fonts, preferably under
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OFL or similar license.
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