def test(self):
direction = Direction(1, -1, -1, 1)
position = (3, 5, 2, 1)
actual = direction.get_previous_step_positions(position)
expected = [(2, 5, 2, 1), (3, 6, 2, 1), (3, 5, 3, 1), (3, 5, 2, 0)]
self.assertEqual(expected, actual)
def test_going_right_to_left(self):
direction = Direction(-1)
position = (3,)
self.assertEqual([(4,)], direction.get_previous_step_positions(position))