def test_are_not_orthogonal(self):
     a = Point(1, 0.7)
     b = Point(0.5, 1)
     assert not a.is_orthogonal(b)
 def test_are_orthogonal(self):
     a = Point(0.5, 0.5)
     b = Point(-1, 1)
     assert a.is_orthogonal(b)