RxJava在Android中进行故障测试Presenter

嗨，我想测试一个Android主持人使用mockito，我有很多麻烦。 这是我想测试的代码： 

public class SignUpPresenter extends BasePresenter { private static final String TAG = SignUpPresenter.class.getSimpleName(); private final AuthRepository mAuthRepository; private final SignUpView mView; public SignUpPresenter(@NonNull SignUpView view, @NonNull AuthRepository authRepository) { this.mAuthRepository = authRepository; this.mView = view; } public void signUp(@NonNull String username, @NonNull String password, @NonNull String email) { mCompositeDisposable.add(mAuthRepository.signUp(username, password, email) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableSingleObserver<TokenWrapper>() { @Override public void onSuccess(TokenWrapper t) { Log.i(TAG, "Signed Up: " + t.getUser().getUsername()); mView.onSuccessSignUp(t.getUser(), t.getToken()); } @Override public void onError(Throwable e) { Log.e(TAG, "Sign Up: " + e.getMessage()); mView.onErrorSignUp(e.getMessage()); } })); } }

测试代码： 

 public class SignUpPresenterTest { @Rule public MockitoRule mMockitoRule = MockitoJUnit.rule(); @Mock public SignUpView mView; @Mock public AuthRepository mRepository; SignUpPresenter mPresenter; User mUser = new User(); @Before public void setUp() { mPresenter = new SignUpPresenter(mView, mRepository); } @Test public void onSuccessSignUpTest() throws InterruptedException { TokenWrapper token = new TokenWrapper(mUser, null); when(mRepository.signUp("Username", "password", "asdf@msais.com")) .thenReturn(Single.just(token)); mPresenter.signUp("Username", "password", "asdf@msais.com"); verify(mView).onSuccessSignUp(mUser, null); } @Test public void onSignUpErrorTest() { when(mRepository.signUp("Username", "password", "asdf@msais.com")) .thenReturn(Single.error(new Throwable("Error"))); mPresenter.signUp("Username", "password", "asdf@msais.com"); verify(mView).onErrorSignUp("Error"); } }

而例外： 

  Wanted but not invoked: mView.onSuccessSignUp( com.andiag.trainingsquad.models.entities.User@d6e7bab, null ); -> at com.andiag.trainingsquad.SignUpPresenterTest.onSuccessSignUpTest(SignUpPresenterTest.java:51) Actually, there were zero interactions with this mock. Wanted but not invoked: mView.onSuccessSignUp( com.andiag.trainingsquad.models.entities.User@d6e7bab, null ); -> at com.andiag.trainingsquad.SignUpPresenterTest.onSuccessSignUpTest(SignUpPresenterTest.java:51) Actually, there were zero interactions with this mock. at com.andiag.trainingsquad.SignUpPresenterTest.onSuccessSignUpTest(SignUpPresenterTest.java:51) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.mockito.internal.junit.JUnitRule$1.evaluateSafely(JUnitRule.java:63) at org.mockito.internal.junit.JUnitRule$1.evaluate(JUnitRule.java:43) 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.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

谢谢您的帮助。

我认为问题出现在后台线程中（ .subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()) ）：单元测试在被测试的计算之前完成。

您应该尝试使用测试规则将您的线程映射到单元测试中的当前线程。 类似的东西（我的片段是在Kotlin，但希望总体思路是清楚的）： 

 class SchedulersOverrideRule(private val scheduler: Scheduler = Schedulers.trampoline()) : TestRule { override fun apply(base: Statement, description: Description?): Statement { return object : Statement() { override fun evaluate() { RxJavaPlugins.setIoSchedulerHandler { scheduler } RxJavaPlugins.setComputationSchedulerHandler { scheduler } RxJavaPlugins.setNewThreadSchedulerHandler { scheduler } RxAndroidPlugins.setInitMainThreadSchedulerHandler { scheduler } RxAndroidPlugins.setMainThreadSchedulerHandler { scheduler } try { base.evaluate() } finally { RxJavaPlugins.reset() RxAndroidPlugins.reset() } } } } }

并将MockitoRule应用于您的测试中的方式应用此规则。

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