def test_raises_valueerror_when_attempting_lighten_with_invalid_type(
dummy_image: Image, level: int):
with pytest.raises(ValueError):
dummy_image.lighten(level=level)
def test_lighten_operation_respects_maximum_grayscale(dummy_image: Image):
p = GrayPixel(100)
dummy_image.set_pixel(1, 1, p)
ligthen_img = dummy_image.lighten(200)
assert not any(val.value > 255 for row in ligthen_img.values
for val in row)
