Java 使用Spring引导REST API Crud的JUnit中出现Null错误

下面是我的测试代码，结果是NULL

public class MybatisApplicationTests {
@InjectMocks
UserController uc;
@Mock
UserService userService;

@Test
public void getUserByIdTest() {
    Long id= 6L;
    assertNotNull(uc.getUserById(id));
  }
}

我的控制器UserController.java如下所示

 @GetMapping("/getUserById/{id}")
public User getUserById(@PathVariable("id") Long id) {
    User user = userService.getUserById(id);
    return user;
}

@Override
public User getUserById(@PathVariable("id") Long id) {
     User user = userMapper.getUserById(id);
     return user;
}

我的getUserById的ServiceImpl.java如下所示

 @GetMapping("/getUserById/{id}")
public User getUserById(@PathVariable("id") Long id) {
    User user = userService.getUserById(id);
    return user;
}

@Override
public User getUserById(@PathVariable("id") Long id) {
     User user = userMapper.getUserById(id);
     return user;
}

当运行上面的代码时，我得到下面的错误

org.opentest4j.AssertionFailedError: expected: not <null>
at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:39)
at org.junit.jupiter.api.Assertions.fail(Assertions.java:109)

org.opentest4j.AssertionFailedError:应为：非
位于org.junit.jupiter.api.AssertionUtils.fail（AssertionUtils.java:39）
位于org.junit.jupiter.api.Assertions.fail（Assertions.java:109）

---

请帮助我解决同样的问题&提前感谢。

您必须初始化您的模拟，然后声明您的模拟行为，尝试这样更改您的测试类：

public class MybatisApplicationTests {

@InjectMocks
UserController uc;

@Mock
UserService userService;

@Before
void setUp(){
   initMocks(this);
}

@Test
public void getUserByIdTest() {
    Long id= 6L;
    User mockUser = mock(User.class);

    when(userService.getUserById(id)).thenReturn(mockUser);

    User actual = uc.getUserById(id);

    assertEquals(userMock, actual);
  }
}

---

您必须初始化您的模拟，然后必须声明您的模拟行为，尝试这样更改您的测试类：

public class MybatisApplicationTests {

@InjectMocks
UserController uc;

@Mock
UserService userService;

@Before
void setUp(){
   initMocks(this);
}

@Test
public void getUserByIdTest() {
    Long id= 6L;
    User mockUser = mock(User.class);

    when(userService.getUserById(id)).thenReturn(mockUser);

    User actual = uc.getUserById(id);

    assertEquals(userMock, actual);
  }
}

我认为这就是你的解决方案所缺少的

我认为这就是你的解决方案所缺少的