Pillow/Tests/test_file_dcx.py

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from helper import unittest, PillowTestCase, hopper
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from PIL import Image, DcxImagePlugin
# Created with ImageMagick: convert hopper.ppm hopper.dcx
TEST_FILE = "Tests/images/hopper.dcx"
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class TestFileDcx(PillowTestCase):
def test_sanity(self):
# Arrange
# Act
im = Image.open(TEST_FILE)
# Assert
self.assertEqual(im.size, (128, 128))
self.assertIsInstance(im, DcxImagePlugin.DcxImageFile)
orig = hopper()
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self.assert_image_equal(im, orig)
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def test_invalid_file(self):
with open("Tests/images/flower.jpg", "rb") as fp:
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self.assertRaises(SyntaxError,
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DcxImagePlugin.DcxImageFile, fp)
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def test_tell(self):
# Arrange
im = Image.open(TEST_FILE)
# Act
frame = im.tell()
# Assert
self.assertEqual(frame, 0)
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def test_n_frames(self):
im = Image.open(TEST_FILE)
self.assertEqual(im.n_frames, 1)
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self.assertFalse(im.is_animated)
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def test_eoferror(self):
im = Image.open(TEST_FILE)
n_frames = im.n_frames
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# Test seeking past the last frame
self.assertRaises(EOFError, im.seek, n_frames)
self.assertLess(im.tell(), n_frames)
# Test that seeking to the last frame does not raise an error
im.seek(n_frames-1)
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def test_seek_too_far(self):
# Arrange
im = Image.open(TEST_FILE)
frame = 999 # too big on purpose
# Act / Assert
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self.assertRaises(EOFError, im.seek, frame)
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if __name__ == '__main__':
unittest.main()