def test_transform_tr(self): result = Domain._transform_tr(4.0, 1.3, [0.015, 0.005]) self.assertIsInstance(result, tuple) self.assertEquals(len(result), 4) map(lambda el: self.assertIsInstance(el, float), result) with self.assertRaises(ValueError) as param_err: Domain._transform_tr(4.0, 1.3, [5.0, 0.005]) self.assertEqual(param_err.message, '"-tr" is too large. width is 4.0, height is 1.3 ')