@Test public void clearTest() { model.addSquareBumper(0, 0, 0, "sBump"); model.addCircularBumper(0, 20, 0, "cBump"); model.addTriangularBumper(0, 40, 0, "tBump"); model.clear(); assertTrue(model.getBumper("sBump") == null); assertTrue(model.getBumper("cBump") == null); assertTrue(model.getBumper("tBump") == null); assertTrue(model.getBumpers().size() == 0); }