def test_slide_xy(self):
point = Point(2, 1)
point.slide_xy(4, 3)
self.assertEqual(point.x, 6)
self.assertEqual(point.y, 4)
def test_slide_xy_negative(self):
point = Point(2, 1)
point.slide_xy(-4, -5)
self.assertEqual(point.x, -2)
self.assertEqual(point.y, -4)
