from helper import unittest, PillowTestCase, hopper from PIL import Image, DcxImagePlugin # Created with ImageMagick: convert hopper.ppm hopper.dcx TEST_FILE = "Tests/images/hopper.dcx" 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() self.assert_image_equal(im, orig) def test_invalid_file(self): with open("Tests/images/flower.jpg", "rb") as fp: self.assertRaises(SyntaxError, DcxImagePlugin.DcxImageFile, fp) def test_tell(self): # Arrange im = Image.open(TEST_FILE) # Act frame = im.tell() # Assert self.assertEqual(frame, 0) def test_n_frames(self): im = Image.open(TEST_FILE) self.assertEqual(im.n_frames, 1) self.assertFalse(im.is_animated) def test_eoferror(self): im = Image.open(TEST_FILE) n_frames = im.n_frames # 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) def test_seek_too_far(self): # Arrange im = Image.open(TEST_FILE) frame = 999 # too big on purpose # Act / Assert self.assertRaises(EOFError, im.seek, frame) if __name__ == '__main__': unittest.main()