### Question:
ValidateService { public static ValidateService getInstance() { return INSTANCE; } private  ValidateService(); static ValidateService getInstance(); boolean add(final User newUser); boolean update(final User newUser); boolean delete(final int id); List<User> findAll(); User findById(final int id); User findByLogin(final String login);  }### Answer:
@Test public void getInstanceForAllTimeShouldBeReturnSomeObject() { ValidateService secondTestValidator = ValidateService.getInstance(); assertThat(this.testValidator, is(secondTestValidator)); }