@Before
 @Test
 public void testPut() throws Exception {
   hashMapImplementation = new HashMapImplementation<Integer, String>();
   hashMapImplementation.put(1, "Hasan");
   hashMapImplementation.put(10, "Mustafa");
   hashMapImplementation.put(13, "Mehmet");
 }
 @Test
 public void testRemove() {
   Assert.assertTrue(hashMapImplementation.remove(1));
 }
 @Test
 public void testGet() {
   Assert.assertEquals("Mehmet", hashMapImplementation.get(13));
 }