Question

我有单元测试来测试用户存储库，我使用自定义规则覆盖调度程序，我仍然得到NullPointerException

这是测试代码

public class UserRepositoryTest extends BaseTest {

    @Mock
    private UserMapper userMapper;

    @Mock
    private GithubService githubService;

    @Mock
    private Throwable throwable;

    @InjectMocks
    private UserRepository userRepository;

    @Test
    public void fetchUsersEmitsErrorWhenNetworkServiceErrors() {
        when(githubService.getUsers()).thenReturn(Single.error(throwable));
        userRepository.fetchUsers().test().assertError(throwable);
    }

    @Test
    public void usersRawItemsFromServiceAreMapped() throws Exception {
        List<UserRaw> userRawList = createUserRawList();
        when(githubService.getUsers()).thenReturn(Single.just(userRawList));

        userRepository.fetchUsers().subscribe();

        verify(userMapper).apply(userRawList.get(0));
        verify(userMapper).apply(userRawList.get(1));
        verify(userMapper).apply(userRawList.get(2));
    }

    private static List<UserRaw> createUserRawList() {
        return new ArrayList<UserRaw>() {
            {
                add(mock(UserRaw.class));
                add(mock(UserRaw.class));
                add(mock(UserRaw.class));
            }
        };
    }

}

测试从

扩展的基类

@RunWith(MockitoJUnitRunner.StrictStubs.class)
public abstract class BaseTest {

    @Rule
    public final MockitoRule rule = MockitoJUnit.rule();

    @Rule
    public final RxSchedulerOverrideRule overrideSchedulersRule = new RxSchedulerOverrideRule();

}

自定义规则

public class RxSchedulerOverrideRule implements TestRule {

    @Override
    public Statement apply(final Statement base, Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                RxJavaPlugins.setIoSchedulerHandler(scheduler -> Schedulers.trampoline());
                RxJavaPlugins.setComputationSchedulerHandler(scheduler -> Schedulers.trampoline());
                RxJavaPlugins.setNewThreadSchedulerHandler(scheduler -> Schedulers.trampoline());
                try {
                    base.evaluate();
                } finally {
                    RxJavaPlugins.reset();
                }
            }
        };
    }

}

以及存储库代码中的代码

 public Single<List<User>> fetchUsers() {
        return githubService.getUsers()
                .subscribeOn(Schedulers.io())
                .observeOn(Schedulers.computation())
                .flatMapObservable(Observable::fromIterable)
                .map(userMapper)
                .toList();
    }

我认为这个bug非常奇怪，因为我已经覆盖了存储库调度程序

这条消息

java.lang.NullPointerException at com.ahmedabdelmeged.githubarch.data.UserRepository.fetchUsers（UserRepository.java:41）在 com.ahmedabdelmeged.githubarch.data.UserRepositoryTest.usersRawItemsFromServiceAreMapped（UserRepositoryTest.java:46） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498）at org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（FrameworkMethod.java:50）在 org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）在 org.junit.runners.model.FrameworkMethod.invokeExplosively（FrameworkMethod.java:47）在 org.junit.internal.runners.statements.InvokeMethod.evaluate（InvokeMethod.java:17）在 org.mockito.internal.junit.JUnitRule $ 1.evaluateSafely（JUnitRule.java:63）在org.mockito.internal.junit.JUnitRule $ 1.evaluate（JUnitRule.java:43）在 com.ahmedabdelmeged.githubarch.common.RxSchedulerOverrideRule $ 1.evaluate（RxSchedulerOverrideRule.java:24）

RxJava在Schedulers.io（）上测试NullPointerException

0 个答案: