@Test public void setTiersTest() {

   c1.setLayers(4);
   int result1 = c1.getLayers();
   Assert.assertEquals("", 4, result1);
   c2.setLayers(1);
   int result2 = c2.getLayers();
   Assert.assertFalse("", 0 == result2);
   c3.setLayers(3);
   int result3 = c3.getLayers();
   Assert.assertTrue("", 3 == result3);
}