from helper import unittest, PillowTestCase from PIL import Image TEST_FILE = "Tests/images/hopper.ppm" ORIGINAL_LIMIT = Image.MAX_IMAGE_PIXELS class TestDecompressionBomb(PillowTestCase): def tearDown(self): Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT def test_no_warning_small_file(self): # Implicit assert: no warning. # A warning would cause a failure. Image.open(TEST_FILE) def test_no_warning_no_limit(self): # Arrange # Turn limit off Image.MAX_IMAGE_PIXELS = None self.assertEqual(Image.MAX_IMAGE_PIXELS, None) # Act / Assert # Implicit assert: no warning. # A warning would cause a failure. Image.open(TEST_FILE) def test_warning(self): # Arrange # Set limit to a low, easily testable value Image.MAX_IMAGE_PIXELS = 10 self.assertEqual(Image.MAX_IMAGE_PIXELS, 10) # Act / Assert self.assert_warning( Image.DecompressionBombWarning, lambda: Image.open(TEST_FILE)) if __name__ == '__main__': unittest.main()