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

        user.setSurname("Doe");
        assertEquals("Doe", user.getSurname());
    }

    @Test
    public void test_user_businessCategory() {
        final User user = new User();
        assertNull(user.getBusinessCategory());

        user.setBusinessCategory("Engineering");
        assertEquals("Engineering", user.getBusinessCategory());