### Question:
Board extends AbstractBoard<Elements> { public boolean isGameOver() { return get(Elements.TANK_UP, Elements.TANK_DOWN, Elements.TANK_LEFT, Elements.TANK_RIGHT).isEmpty(); }  @Override Elements valueOf(char ch); boolean isBarrierAt(int x, int y); List<Point> getBarriers(); Point getMe(); List<Point> getEnemies(); List<Point> getBullets(); boolean isGameOver(); Elements getAt(int x, int y); boolean isBulletAt(int x, int y); @Override String toString();  }### Answer:
@Test public void shouldWork_isGameOver() { assertEquals(false, board.isGameOver()); assertEquals(true, board(" ").isGameOver()); }