def test_not_image(self):
        self.assertRaises(
            IOError,
            source_generators.pil_image, BytesIO(six.b('not an image')))
term : factor IS_EQUALS NOT factor
dataset/ETHPy150Open SmileyChris/easy-thumbnails/easy_thumbnails/tests/test_source_generators.py/PilImageTest.test_not_image--crossover with--dataset/ETHPy150Open armon/pypred/pypred/parser.py/p_term_is_not