def test_image_class(self): """Test the Image class.""" image = Image(id='The hash id') with open("oppia/tests/data/img.png") as f: image_file = File(f) image_file_content = f.read() image.raw = image_file image.save() # Retrieve the image. retrieved_image = Image.objects.get(id='The hash id') # Read its content retrieved_content = retrieved_image.raw.read() self.assertEqual(retrieved_content, image_file_content)