def test_east_right(self): self.assertEqual(1j, change_face(1, 1))
def test_east_left(self): self.assertEqual(-1j, change_face(1, -1))
def test_north_right(self): self.assertEqual(1, change_face(-1j, 1))
def test_south_left(self): self.assertEqual(1, change_face(1j, -1))
def test_west_left(self): self.assertEqual(1j, change_face(-1, -1))
def test_north_left(self): self.assertEqual(-1, change_face(-1j, -1))
def test_west_right(self): self.assertEqual(-1j, change_face(-1, 1))
def test_south_right(self): self.assertEqual(-1, change_face(1j, 1))