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Web accessibility is important. Unfortunately currently many pygments
styles have rules with poor contrasts. This commit introduces a test
case that fails if the minimum contrast of a style gets worse, e.g:
E AssertionError: contrast degradation for style 'borland'
E The following rules have a contrast lower than the required 2.9:
E
E * 1.90 Token.Text.Whitespace
E * 2.80 Token.Generic.Heading
E * 2.30 Token.Generic.Subheading
E
E assert not 1.9 < 2.9
This is accomplished by storing the current minimum contrasts in
./tests/contrast/min_contrasts.json.
When you improve a minimum contrast the test fails with:
E AssertionError: congrats, you improved a contrast! please run ./scripts/update_contrasts.py
E assert not 1.9 > 0.9
Running the script as instructed updates the JSON file, making the test pass.
New styles are required to meet the WCAG AA contrast minimum of 4.5.
First commit to address #1718.
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