Mockito 测试预期异常

Question

我正在尝试在 spring-boot 中测试我的服务层和存储库，为此，我使用 Mockito，作为测试的一部分，我验证任何登录请求，如果用户名或密码不正确，则会出现异常应该被扔掉。

我正在测试用户是否存在并且测试通过，但是，当用户名不存在时，我似乎无法让测试通过。这是我的 tets 代码

@Mock
UserRepository userRepository;

@InjectMocks
UserServiceImpl userServiceImpl;

Users mockUser = Mockito.mock(Users.class);

private String username = "real_user";

private String fakeUser = "fake_user";

@Before
public void setup() {
    mockUser.setUsername(username);
    mockUser.setPassword(new BCryptPasswordEncoder().encode("password"));
    mockUser.setEnabled(true);
}

/**
 * This Test Passes
 */
@Test
public void should_LoadUsersByUsername_IfUserExists() {
    Mockito.when(userRepository.findByUsername(username)).thenReturn(mockUser);
    userServiceImpl.loadUserByUsername(username);
    Mockito.verify(userRepository, Mockito.atLeastOnce()).findByUsername(username);
}

/**
 * This Test Fails
 */
@Test(expected = UsernameNotFoundException.class)
public void should_Throw_UserNameNotFoundException_If_UserIsNotFound() {
    Mockito
       .when(userRepository.findByUsername(fakeUser))
       .thenThrow(UsernameNotFoundException.class);
}

这是我试图运行测试的代码

@Service
public class UserServiceImpl implements UserService {

@Autowired
UserRepository userRepository;

@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    Users user = userRepository.findByUsername(username);
    if (user == null) {//I'm trying to hit this line with my test that fails
        throw new UsernameNotFoundException("The user was not found");
    }
    return user;
}

当我运行测试时，我得到以下结果

java.lang.AssertionError: Expected exception: org.springframework.security.core.userdetails.UsernameNotFoundException
    at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:32)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:79)
    at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:85)
    at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
    at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

下面的行让我感到困惑，因为在我的测试中我指出UsernameNotFoundException如果用户不存在则应该抛出

java.lang.AssertionError: Expected exception: org.springframework.security.core.userdetails.UsernameNotFoundException

我按照这里找到的教程进行操作2

非空返回类型

但运气不好，我知道我可以使用来实现我的目标，但我想首先JUnit尝试使用Mockito

我知道我错过了一些东西，任何人都可以帮助我了解这里发生的事情

Answer 1

loadUserByUsername在失败的测试用例中，您根本没有调用函数。这应该有效。

@Test(expected = UsernameNotFoundException.class)
public void should_Throw_UserNameNotFoundException_If_UserIsNotFound() {
    Mockito
       .when(userRepository.findByUsername(fakeUser))
       .thenThrow(UsernameNotFoundException.class);
   userServiceImpl.loadUserByUsername(fakeUser);
}

由于您没有调用该函数，因此永远不会抛出异常，但是您已经告诉 Mockito 将会出现异常，因此 Mockito 说

java.lang.AssertionError：预期异常：org.springframework.security.core.userdetails.UsernameNotFoundException