assertNull(user.getTitle());

        user.setTitle("Senior Engineer");
        assertEquals("Senior Engineer", user.getTitle());
    }

    @Test
    public void test_user_postalCode() {
        final User user = new User();
        assertNull(user.getPostalCode());

        user.setPostalCode("12345");
        assertEquals("12345", user.getPostalCode());
    }

    @Test