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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.
86 lines
2.6 KiB
Python
86 lines
2.6 KiB
Python
from .helper import PillowTestCase, hopper
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from PIL import Image
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TEST_FILE = "Tests/images/hopper.ppm"
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ORIGINAL_LIMIT = Image.MAX_IMAGE_PIXELS
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class TestDecompressionBomb(PillowTestCase):
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def tearDown(self):
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Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT
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def test_no_warning_small_file(self):
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# Implicit assert: no warning.
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# A warning would cause a failure.
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Image.open(TEST_FILE)
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def test_no_warning_no_limit(self):
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# Arrange
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# Turn limit off
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Image.MAX_IMAGE_PIXELS = None
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self.assertIsNone(Image.MAX_IMAGE_PIXELS)
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# Act / Assert
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# Implicit assert: no warning.
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# A warning would cause a failure.
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Image.open(TEST_FILE)
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def test_warning(self):
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# Set limit to trigger warning on the test file
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Image.MAX_IMAGE_PIXELS = 128 * 128 - 1
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self.assertEqual(Image.MAX_IMAGE_PIXELS, 128 * 128 - 1)
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self.assert_warning(Image.DecompressionBombWarning,
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Image.open, TEST_FILE)
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def test_exception(self):
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# Set limit to trigger exception on the test file
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Image.MAX_IMAGE_PIXELS = 64 * 128 - 1
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self.assertEqual(Image.MAX_IMAGE_PIXELS, 64 * 128 - 1)
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self.assertRaises(Image.DecompressionBombError,
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lambda: Image.open(TEST_FILE))
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class TestDecompressionCrop(PillowTestCase):
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def setUp(self):
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self.src = hopper()
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Image.MAX_IMAGE_PIXELS = self.src.height * self.src.width * 4 - 1
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def tearDown(self):
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Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT
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def testEnlargeCrop(self):
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# Crops can extend the extents, therefore we should have the
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# same decompression bomb warnings on them.
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box = (0, 0, self.src.width * 2, self.src.height * 2)
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self.assert_warning(Image.DecompressionBombWarning,
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self.src.crop, box)
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def test_crop_decompression_checks(self):
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im = Image.new("RGB", (100, 100))
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good_values = ((-9999, -9999, -9990, -9990),
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(-999, -999, -990, -990))
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warning_values = ((-160, -160, 99, 99),
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(160, 160, -99, -99))
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error_values = ((-99909, -99990, 99999, 99999),
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(99909, 99990, -99999, -99999))
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for value in good_values:
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self.assertEqual(im.crop(value).size, (9, 9))
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for value in warning_values:
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self.assert_warning(Image.DecompressionBombWarning, im.crop, value)
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for value in error_values:
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with self.assertRaises(Image.DecompressionBombError):
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im.crop(value)
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