Unicodes test of DesignspaceProblems

https://github.com/LettError/DesignspaceProblems

LettError/DesignspaceProblems#7

I wanted to check whether this code did what was intended, as I didn't quite understand it.

I've added some simple test UFOs plus a designspace in unicodes-test-project, and then made the script build/lib/unicode-test.py to check that designspace.

Sure enough, it's catching three different types of unicode issues:

• glyph of one name has unique unicodes between masters (i.e. /A has 0041 in one master, but 0080 in another
• glyph has "None" for its unicode value in some masters (i.e. /B has 0042 in one master, but None in another)
• glyph has two unicodes in one master, but just one unicode in another (i.e. /C has 0043 in one master, but 0043 and 0049 in another)

▶ python designspace_problems-unicode-test.py

[[glyphs: different unicodes in glyph, glyphName: C unicodes: [73] (4, 10)],
[glyphs: different unicodes in glyph, glyphName: B unicodes: [None, 66] (4, 10)],
[glyphs: different unicodes in glyph, glyphName: A unicodes: [65, 128] (4, 10)]]

I made this test because I tend to interact with DesignspaceProblems via the DesignspaceEditor extension for RoboFont, and it doesn't (currently) catch these problems in the same designspace.

Replicate test

1. Set up a venv: python3 -m venv venv
2. Activate it: source venv/bin/activate
3. Install dependencies: pip install -r requirements.txt
4. Run the test: python designspace_problems-unicode-test.py