def test_addition(self):
a = Coordinate(1, 2, 3)
b = Coordinate(4, 5, 6)
a.add(Coordinate(3, 3, 3))
self.assertEqual(a, b)
def test_addition(self):
a = Coordinate(1, 2, 3)
b = Coordinate(4, 5, 6)
a.add(Coordinate(3, 3, 3))
self.assertEqual(a, b)