@Test
 public void testClone() {
   OpenDoubleObjectHashMap<TestClass> map = new OpenDoubleObjectHashMap<TestClass>();
   map.put((double) 11, item);
   OpenDoubleObjectHashMap<TestClass> map2 = (OpenDoubleObjectHashMap<TestClass>) map.clone();
   map.clear();
   assertEquals(1, map2.size());
 }