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from hypothesis import given
from hypothesis.strategies import floats, tuples
import pytest
import wcag_contrast_ratio as contrast
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_contrast(rgb1, rgb2, expected):
c1 = contrast.rgb(rgb1, rgb2)
c2 = contrast.rgb(rgb2, rgb1)
assert c1 == expected
assert c2 == expected
@pytest.mark.parametrize("c,expected,large_expected",
[(0.0, False, False),
(2.9, False, False),
(3.0, False, True),
(3.1, False, True),
(4.4, False, True),
(4.5, True, True),
(4.6, True, True),
(6.9, True, True),
(7.0, True, True),
(7.1, True, True),
(21.0, True, True)])
def test_passes_AA(c, expected, large_expected):
got = contrast.passes_AA(c, large=False)
assert got == expected
got_large = contrast.passes_AA(c, large=True)
assert got_large == large_expected
@pytest.mark.parametrize("c,expected,large_expected",
[(0.0, False, False),
(2.9, False, False),
(3.0, False, False),
(3.1, False, False),
(4.4, False, False),
(4.5, False, True),
(4.6, False, True),
(6.9, False, True),
(7.0, True, True),
(7.1, True, True),
(21.0, True, True)])
def test_passes_AAA(c, expected, large_expected):
got = contrast.passes_AAA(c, large=False)
assert got == expected
got_large = contrast.passes_AAA(c, large=True)
assert got_large == large_expected
@given(color, color)
def test_hypothesis_contrast(rgb1, rgb2):
c1 = contrast.rgb(rgb1, rgb2)
c2 = contrast.rgb(rgb1, rgb2)
assert 1.0 <= c1 <= 21.0
assert c1 == c2
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