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test for wrong channels number in generate

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Alexander 2018-04-11 20:55:35 +03:00
parent ecd0e5e15e
commit fb1d25417e
1 changed files with 4 additions and 0 deletions
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Tests/test_color_lut.py
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@ -269,6 +269,10 @@ class TestColorLut3DFilter(PillowTestCase):
class TestGenerateColorLut3D(PillowTestCase):
def test_wrong_channels_count(self):
with self.assertRaisesRegexp(ValueError, "3 or 4 output channels"):
ImageFilter.Color3DLUT.generate(5, channels=2,
callback=lambda r, g, b: (r, g, b))
with self.assertRaisesRegexp(ValueError, "should have either channels"):
ImageFilter.Color3DLUT.generate(5, lambda r, g, b: (r, g, b, r))