def test_unspecified_new_dimensions(self): original_width, original_height = (800, 600) new_width, new_height = (None, None) rescaled_width, rescaled_height, top_margin, bottom_margin, left_margin, right_margin = \ rescale_and_keep_aspect_ratio(original_width, original_height, new_width, new_height) self.assertEqual(800, rescaled_width) self.assertEqual(600, rescaled_height) self.assertEqual(0, top_margin) self.assertEqual(0, bottom_margin) self.assertEqual(0, left_margin) self.assertEqual(0, right_margin)
def test_taller_aspect_ratio(self): original_width, original_height = (800, 600) new_width, new_height = (800, 800) rescaled_width, rescaled_height, top_margin, bottom_margin, left_margin, right_margin = \ rescale_and_keep_aspect_ratio(original_width, original_height, new_width, new_height) self.assertEqual(800, rescaled_width) self.assertEqual(600, rescaled_height) self.assertEqual(100, top_margin) self.assertEqual(100, bottom_margin) self.assertEqual(0, left_margin) self.assertEqual(0, right_margin)
def test_zero_dimensions(self): original_width, original_height = (800, 600) new_width, new_height = (0, 600) with self.assertRaises(ValueError): rescale_and_keep_aspect_ratio( original_width, original_height, new_width, new_height, ) new_width, new_height = (800, 0) with self.assertRaises(ValueError): rescale_and_keep_aspect_ratio( original_width, original_height, new_width, new_height, ) original_width, original_height = (0, 600) new_width, new_height = (800, 600) with self.assertRaises(ValueError): rescale_and_keep_aspect_ratio( original_width, original_height, new_width, new_height, ) original_width, original_height = (800, 0) with self.assertRaises(ValueError): rescale_and_keep_aspect_ratio( original_width, original_height, new_width, new_height, )