def test_manhattan_distance_yields_one(self):
tile = Mover.move_down(Tile())
self.assertEqual(self.metrics.manhattan(tile), 1)
def test_move_down_yields_nothing(self):
self.assertEqual(Mover.move_down(Mover.move_down(Tile())), None)
def test_move_down_has_the_empty_row_in_the_middle(self):
expectedTile = [[1, 2, 3], [8, 0, 4], [7, 6, 5]]
self.assertEqual(
Mover.move_down(Mover.move_up(Tile())).layout, expectedTile)
def test_move_down_gives_a_board_with_the_open_tile_in_the_bottom(self):
layout = [[1, 2, 3], [8, 6, 4], [7, 0, 5]]
self.assertEqual(Mover.move_down(Tile()).layout, layout)