如何在SpringSecurity Bean中模拟自定义UserServiceDetails进行单元测试？

@Service
public class CustomUserDetailsService implements UserDetailsService {

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        // 根据用户名查询数据库或其他数据源，获取用户信息
        // 创建UserDetails对象，并设置相应的用户信息
        return new User(username, "password", new ArrayList<>());
    }
}

@RunWith(MockitoJUnitRunner.class)
public class CustomUserDetailsServiceTest {

    @Mock
    private UserRepository userRepository;

    @InjectMocks
    private CustomUserDetailsService customUserDetailsService;

    @Test
    public void testLoadUserByUsername() {
        // 模拟userRepository的行为，返回指定的用户数据
        User user = new User("testUser", "password", new ArrayList<>());
        Mockito.when(userRepository.findByUsername("testUser")).thenReturn(user);

        // 调用自定义UserServiceDetails的loadUserByUsername方法
        UserDetails userDetails = customUserDetailsService.loadUserByUsername("testUser");

        // 验证返回的UserDetails对象是否符合预期
        assertEquals("testUser", userDetails.getUsername());
        assertEquals("password", userDetails.getPassword());
    }
}