final User user = new User();
        assertNull(user.getId());

        user.setId("user-123");
        assertEquals("user-123", user.getId());
    }

    @Test
    public void test_user_setName() {
        final User user = new User();
        user.setName("testuser");
        assertEquals("testuser", user.getName());
    }

    @Test
    public void test_user_setPassword() {