user.setPostalAddress("123 Main St, San Francisco, CA 12345");
        assertEquals("123 Main St, San Francisco, CA 12345", user.getPostalAddress());
    }

    @Test
    public void test_user_roomNumber() {
        final User user = new User();
        assertNull(user.getRoomNumber());

        user.setRoomNumber("101");
        assertEquals("101", user.getRoomNumber());
    }

    @Test