java - 如何在测试过程中使用Mapstruct创建的映射器作为@Mock

Question

背景

我有一个简单的测试方法testFindByUserName。我使用mockito库。我有 @Mock UserMapper，它是由 Mapstruct 库创建的。

问题

Mocito 不处理我用来将用户映射到 userDto 的静态方法 INSTANCE。我有错误:错误:org.mockito.exceptions.misusing.MissingMethodInitationException:when() 需要一个参数，该参数必须是“模拟上的方法调用”。例如: when(mock.getArticles()).thenReturn(articles);

此外，出现此错误的原因可能是:1. stub 以下任一方法:final/private/equals()/hashCode() 方法。 这些方法无法被 stub /验证。 不支持在非公共(public)父类上声明的模拟方法。2.在when()中，你不会调用mock上的方法，而是调用其他对象上的方法。

如何解决这个问题。

代码

@RunWith(MockitoJUnitRunner.class)
@SpringBootTest
public class UserServiceImplTest {

private User user;

private String token;

private UserDto userDto;


@InjectMocks
private UserServiceImpl userService;

@Mock
private UserMapper userMapper;

@Before
public void before() {
    user = new User(2L, "User_test",
            "firstName_test", "lastName_test",
            "test@test.pl", true, "password_test",
            "address_test", null,new ArrayList<>(),new ArrayList<>(), new HashSet<>());
    token = "test_token";
    userDto = new UserDto(2L, "User_test",
            "firstName_test", "lastName_test",
            "test@test.pl", true, "password_test",
            "address_test", null,new ArrayList<>(),new ArrayList<>(), new HashSet<>());

}

@Test
public void testFindByUsername() throws Exception {
    //Given
    String username= "User_test";

    when(userMapper.INSTANCE.userToUserDto(userRepository.findByUsername(username))).thenReturn(userDto);
    //When
    UserDto result = userService.findByUsername(username);

    //Then
    assertEquals("User_test", result.getUsername());
    assertEquals("firstName_test", result.getFirstName());
    assertEquals("lastName_test", result.getLastName());
    assertEquals("test@test.pl", result.getEmail());
    assertEquals("password_test", result.getPassword());
    assertEquals("address_test", result.getAddress());

}

我测试的方法

@Override
public UserDto findByUsername(final String username)  {
    User user = userRepository.findByUsername(username);
    if (user == null) {
        LOGGER.info("Not found user");
    }
        return mapper.INSTANCE.userToUserDto(user);
}

Answer 1

您需要使用PowerMockito要在 Mockito 测试中测试静态方法，请使用以下步骤:

@PrepareForTest(Static.class) // Static.class contains static methods

Call PowerMockito.mockStatic() to mock a static class (use PowerMockito.spy(class) to mock a specific method):

PowerMockito.mockStatic(Static.class);

Just use Mockito.when() to setup your expectation:

Mockito.when(Static.firstStaticMethod(param)).thenReturn(value);