def test_piece_at_with_piece(self):
b = Board().place_piece(p1)
self.assertEqual(b.piece_at((0, 1)), p1)
def test_move_piece(self):
b = Board().place_piece(p2).move_piece((0, 0), (0, 1))
self.assertTrue(isinstance(b.piece_at((0, 1)), Piece))
self.assertEqual(b.piece_at((0, 0)), None)
def test_piece_at_with_no_piece(self):
b = Board()
self.assertEqual(b.piece_at((0, 0)), None)
