Recently I wrote about testing fonts. I finally managed to get an answer from the authors of thai-scalable-fonts.
What is your approach for testing Fonts-TLWG?
It's not automated test. What it does is generate PDF with sample texts at several sizes (the waterfall), pangrams, and glyph table. It needs human eyes to investigate.
What kind of problems is your test suite designed for ?
- Glyph coverage
We also make use of fontforge features to make spotting errors easier, such as - Show extremas - Show almost vertical/horizontal lines/curves
Theppitak Karoonboonyanan, Fonts-TLWG