    @Test
    public void testAdd2Obstacles() {

        assertTrue(board.addObstacle(new Obstacle(5, 10, 0, 0)));
        assertTrue(board.addObstacle(new Obstacle(25, 25, BOARD_SIZE - 25, BOARD_SIZE - 25)));

        verifyTaken(0, 0);
        verifyTaken(4, 9);

        verifyTaken(BOARD_SIZE - 25, BOARD_SIZE - 25);
        verifyTaken(BOARD_SIZE - 1, BOARD_SIZE - 1);
    }