Package

tests/test_theme.py

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+import pathlib
+import tempfile
+import unittest
+import unittest.mock
+
+import generator.theme
+
+class ThemeTests(unittest.TestCase):
+  def test_foregrounds_remain_readable_on_dark_surfaces(self):
+    def luminance(color):
+      channels = [value / 255 for value in color]
+      linear = [value / 12.92 if value <= 0.04045 else ((value + 0.055) / 1.055) ** 2.4 for value in channels]
+      return sum(value * weight for value, weight in zip(linear, (0.2126, 0.7152, 0.0722)))
+    for surface in ('background', 'panel', 'selection'):
+      background = luminance(generator.theme.rgb(surface))
+      self.assertLess(background, 0.06)
+      for name in ('ink', 'muted', 'accent', 'connecting', 'retrying', 'connected', 'danger'):
+        contrast = (luminance(generator.theme.rgb(name)) + 0.05) / (background + 0.05)
+        self.assertGreaterEqual(contrast, 4.5, (name, surface))
+  def test_cpp_colors_match_the_renderer_palette_without_rewriting(self):
+    with tempfile.TemporaryDirectory() as temporary:
+      header = pathlib.Path(temporary) / 'palette.hpp'
+      generator.theme.generate_header(header)
+      stamp = header.stat().st_mtime_ns
+      for name in generator.theme.COLORS:
+        red, green, blue = generator.theme.rgb(name)
+        self.assertIn(f'{name} = vamp_style::color{{{red}, {green}, {blue}, 255}};', header.read_text())
+      generator.theme.generate_header(header)
+      self.assertEqual(stamp, header.stat().st_mtime_ns)
+  def test_invalid_colors_fail_before_writing(self):
+    with unittest.mock.patch.dict(generator.theme.COLORS, {'background': '#xyz'}):
+      with self.assertRaisesRegex(ValueError, 'background'):
+        generator.theme.rgb('background')