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|
import pytest
from hypothesis import given
from hypothesis.strategies import floats, tuples
from a11y_pygments.utils import wcag_contrast as wcag
color_channel = floats(0.0, 1.0)
color = tuples(color_channel, color_channel, color_channel)
@pytest.mark.parametrize(
"rgb1,rgb2,expected",
[
[(0.0, 0.0, 0.0), (1.0, 1.0, 1.0), 21.0],
[(0.0, 0.0, 0.0), (0.0, 0.0, 0.0), 1.0],
[(0.0, 198 / 255.0, 0.0), (0.0, 0.0, 198 / 255.0), 5.000229313902297],
],
)
def test_luminance(rgb1, rgb2, expected):
c1 = wcag.contrast_ratio(rgb1, rgb2)
c2 = wcag.contrast_ratio(rgb2, rgb1)
assert c1 == expected
assert c2 == expected
@pytest.mark.parametrize(
"c1,c2, expected",
[
("#0a1103", "#0a1103", False),
("#F1AAC4", "#FEF8FA", False),
("#610C2B", "#FEF8FA", 12.55),
("#1B78CA", "#FEF8FA", False),
("#1B78CA", "#FEF8FA", False),
("#2E3A89", "#FEF8FA", 9.61),
("#0B3254", "#0B3254", False),
("#FBE9F0", "#0B3254", 11.27),
],
)
def test_passes_contrast(c1, c2, expected):
got = wcag.passes_contrast(wcag.hex_to_rgb01(c1), wcag.hex_to_rgb01(c2), "AA")
assert got == expected
@given(color, color)
def test_contrast(rgb1, rgb2):
c1 = wcag.contrast_ratio(rgb1, rgb2)
c2 = wcag.contrast_ratio(rgb2, rgb1)
assert 1.0 <= c1 <= 21.0
assert c1 == c2
|
