	@Test
	public void testShouldNotAddObjectIfAlreadyExists() throws Exception {

		int sizeBefore = multimap.get(3).size();
		final TestObject oldObject = multimap.get(3).get(0);
		multimap.update(3, new ObjectAddedUpdater<TestObject>(oldObject));
		assertEquals(sizeBefore, multimap.get(3).size());
	}