为什么 androidx espresso .check() 导致 androidx.test.espresso.IdlingResourceTimeoutException

Question

我有一些使用 androidx Espresso 的单元测试每次我运行测试我都会收到以下错误。

androidx.test.espresso.IdlingResourceTimeoutException: Wait for [WorkTrackerIdlingResource] to become idle timed out

为什么我会超时？

在我的单元测试中，这行代码超时， onView(withId(R.id.map_container)).check(matches(isDisplayed()));

单元测试Class:

@RunWith(AndroidJUnit4.class)
@LargeTest
public class CanvassFragmentTest extends TopLevelNavFragmentTest<CanvassFragment> {
    @NonNull
    @Override
    protected TopLevelNavFragment getTargetTopLevelNavFragment(@NonNull MainActivity activity) {
        return activity.mCanvassFragment;
    }

    @Test
    public void mapContainer_isDisplayed() {
        onView(withId(R.id.id1_container)).check(matches(isDisplayed()));
    }


}

和xml，其中包含我们正在尝试测试的视图。

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.company.MapContainerFragment">

    <FrameLayout
        android:id="@+id/id1_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </FrameLayout>

   .....
        app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

我已经尝试更改空闲首选项以便超时为 5 分钟，但我仍然收到错误消息。

编辑 1

根据要求，我添加了代码，我在下面 class 的底部添加了 onTransitionToIdle

public class WaitForWorkRule implements TestRule {

    @Override
    public Statement apply(Statement base, Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                WorkTrackerIdlingResource idler = new WorkTrackerIdlingResource();
                //Espresso.registerIdlingResources(idler);
                IdlingRegistry.getInstance().register(idler);
                try {
                    base.evaluate();
                } finally {
                    IdlingRegistry.getInstance().unregister(idler);
                }
            }
        };
    }

    /**
     * @hide visible for injection
     */
    public static class WorkTrackerIdlingResource implements IdlingResource {

        private static final String TAG = WorkTrackerIdlingResource.class.getSimpleName();

        @Inject
        WorkTracker mWorkTracker;

        @Nullable
        ResourceCallback mResourceCallback;

        public WorkTrackerIdlingResource() {
            getUiTestInjector().inject(this);
        }

        @Override
        public String getName() {
            return TAG;
        }

        @Override
        public boolean isIdleNow() {
            boolean idle = !mWorkTracker.isAnyoneWorking();
            if (idle && mResourceCallback != null) mResourceCallback.onTransitionToIdle();
            return idle;
        }

        @Override
        public void registerIdleTransitionCallback(@Nullable ResourceCallback callback) {
            mResourceCallback = callback;
        }
    }
}

这是我们注册时的代码。

    @Rule
    public final RuleChain mRuleChain;

    public UiTest(@NonNull Class<T> activityClass) {
    mActivityTestRule = new ActivityTestRule<>(activityClass);
    mRuleChain = createRuleChain();
}



@NonNull
private RuleChain createRuleChain() {
    RuleChain chain = RuleChain.emptyRuleChain()
            .around(new InjectionRule())
            .around(new WaitForWorkRule());

    if (loggedIn()) {
        chain = chain.around(new LoggedInRule());
    }

    return chain.around(mActivityTestRule);
}

Answer 1

这里简要解释一下为什么你的测试总是超时：你设置了一个测试规则，在测试开始之前注册一个空闲资源，然后当你的activity启动时，主线程变得繁忙。通常，当主线程空闲时测试将继续，但您的空闲资源现在阻塞它并且不调用 onTransitionToIdle。所以无论你设置多少时间，它都会超时。

我认为您在这里使用空闲资源可能没有用或不正确。如果没有用例，你可以去掉规则，它应该可以正常工作。

为什么 androidx espresso .check() 导致 androidx.test.espresso.IdlingResourceTimeoutException

Why is androidx espresso .check() causing androidx.test.espresso.IdlingResourceTimeoutException

android

unit-testing

android-espresso