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https://github.com/python-pillow/Pillow.git
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4de5477b61
With the introduction and use of pytest, it is simple and easy to
execute specific tests in isolation through documented command line
arguments. Either by specifying the module path or through the `-k
EXPRESSION` argument. There is no longer any need to provide the
boilerplate:
if __name__ == '__main__':
unittest.main()
To every test file. It is simply noise.
The pattern remains in test files that aren't named with `test_*` as
those files are not discovered and executed by pytest by default.
137 lines
3.7 KiB
Python
137 lines
3.7 KiB
Python
from .helper import PillowTestCase
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from PIL import ImagePalette, Image
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class TestImagePalette(PillowTestCase):
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def test_sanity(self):
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ImagePalette.ImagePalette("RGB", list(range(256))*3)
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self.assertRaises(ValueError,
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ImagePalette.ImagePalette, "RGB", list(range(256))*2)
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def test_getcolor(self):
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palette = ImagePalette.ImagePalette()
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test_map = {}
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for i in range(256):
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test_map[palette.getcolor((i, i, i))] = i
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self.assertEqual(len(test_map), 256)
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self.assertRaises(ValueError, palette.getcolor, (1, 2, 3))
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# Test unknown color specifier
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self.assertRaises(ValueError, palette.getcolor, "unknown")
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def test_file(self):
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palette = ImagePalette.ImagePalette("RGB", list(range(256))*3)
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f = self.tempfile("temp.lut")
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palette.save(f)
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p = ImagePalette.load(f)
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# load returns raw palette information
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self.assertEqual(len(p[0]), 768)
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self.assertEqual(p[1], "RGB")
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p = ImagePalette.raw(p[1], p[0])
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self.assertIsInstance(p, ImagePalette.ImagePalette)
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self.assertEqual(p.palette, palette.tobytes())
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def test_make_linear_lut(self):
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# Arrange
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black = 0
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white = 255
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# Act
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lut = ImagePalette.make_linear_lut(black, white)
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# Assert
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self.assertIsInstance(lut, list)
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self.assertEqual(len(lut), 256)
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# Check values
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for i in range(0, len(lut)):
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self.assertEqual(lut[i], i)
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def test_make_linear_lut_not_yet_implemented(self):
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# Update after FIXME
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# Arrange
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black = 1
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white = 255
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# Act
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self.assertRaises(NotImplementedError,
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ImagePalette.make_linear_lut, black, white)
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def test_make_gamma_lut(self):
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# Arrange
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exp = 5
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# Act
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lut = ImagePalette.make_gamma_lut(exp)
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# Assert
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self.assertIsInstance(lut, list)
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self.assertEqual(len(lut), 256)
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# Check a few values
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self.assertEqual(lut[0], 0)
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self.assertEqual(lut[63], 0)
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self.assertEqual(lut[127], 8)
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self.assertEqual(lut[191], 60)
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self.assertEqual(lut[255], 255)
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def test_rawmode_valueerrors(self):
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# Arrange
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palette = ImagePalette.raw("RGB", list(range(256))*3)
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# Act / Assert
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self.assertRaises(ValueError, palette.tobytes)
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self.assertRaises(ValueError, palette.getcolor, (1, 2, 3))
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f = self.tempfile("temp.lut")
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self.assertRaises(ValueError, palette.save, f)
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def test_getdata(self):
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# Arrange
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data_in = list(range(256))*3
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palette = ImagePalette.ImagePalette("RGB", data_in)
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# Act
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mode, data_out = palette.getdata()
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# Assert
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self.assertEqual(mode, "RGB;L")
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def test_rawmode_getdata(self):
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# Arrange
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data_in = list(range(256))*3
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palette = ImagePalette.raw("RGB", data_in)
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# Act
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rawmode, data_out = palette.getdata()
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# Assert
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self.assertEqual(rawmode, "RGB")
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self.assertEqual(data_in, data_out)
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def test_2bit_palette(self):
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# issue #2258, 2 bit palettes are corrupted.
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outfile = self.tempfile('temp.png')
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rgb = b'\x00' * 2 + b'\x01' * 2 + b'\x02' * 2
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img = Image.frombytes('P', (6, 1), rgb)
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img.putpalette(b'\xFF\x00\x00\x00\xFF\x00\x00\x00\xFF') # RGB
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img.save(outfile, format='PNG')
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reloaded = Image.open(outfile)
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self.assert_image_equal(img, reloaded)
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def test_invalid_palette(self):
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self.assertRaises(IOError,
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ImagePalette.load, "Tests/images/hopper.jpg")
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