Есть ли опыт в тестировании

@Test
public void testUserService() {
    UserRepository mockRepo = Mockito.mock(UserRepository.class);
    UserService userService = new UserService(mockRepo);
    
    User testUser = new User("test@email.com", "Test User");
    Mockito.when(mockRepo.findById(1L)).thenReturn(Optional.of(testUser));
    
    User result = userService.getUserById(1L);
    
    assertEquals("Test User", result.getName());
    Mockito.verify(mockRepo).findById(1L);
}