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59 lines
1.6 KiB
Python
59 lines
1.6 KiB
Python
from helper import unittest, 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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# Arrange
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# Set limit to a low, easily testable value
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Image.MAX_IMAGE_PIXELS = 10
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self.assertEqual(Image.MAX_IMAGE_PIXELS, 10)
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# Act / Assert
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self.assert_warning(Image.DecompressionBombWarning,
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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
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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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lambda: self.src.crop(box))
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if __name__ == '__main__':
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unittest.main()
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