@Test
	public void testGetUsersByLastName() {

		man.saveUser(User);
		man.saveUser(User2);
		man.saveUser(User3);
		
		List<User> testList = man.getUsersByLastName("surname");
		
		Assert.assertEquals(2, testList.size());
		Assert.assertEquals(true, testList.contains(User2));
		Assert.assertEquals(true, testList.contains(User3));
	}