def test_add_coords(self):
dummy_coords = Coords('cylindrical',(1.0,1.0,1.0))
self.assertEqual(dummy_coords.cylindrical, (1.0,1.0,1.0))
dummy_coords.add_coords(cartesian=(0.1,0.5,0.2))
self.assertEqual(dummy_coords.cartesian, (0.1,0.5,0.2))
