def test_check_free_on_not_free_cell(self):
board = Board()
board.o(0, 2)
self.assertFalse(board.is_free(0, 2))
def test_check_free_on_free_cell(self):
board = Board()
board.o(0, 2)
self.assertTrue(board.is_free(1, 2))
