android-espresso - 如何使断言等待 IdlingResource 断言

Question

我想使用空闲资源，因为我在我的应用程序中使用 RxJava 和 EventBus，有时我的测试会失败(我认为这是因为同步)。

依赖关系:

androidTestCompile 'com.android.support.test:runner:0.4'
androidTestCompile 'com.android.support.test:rules:0.4'
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
androidTestCompile 'com.android.support.test.espresso:espresso-intents:2.2.1'
androidTestCompile('com.android.support.test.espresso:espresso-contrib:2.2.1') {
    exclude group: 'com.android.support', module: 'appcompat'
    exclude group: 'com.android.support', module: 'support-v4'
    exclude module: 'recyclerview-v7'
}
androidTestCompile 'junit:junit:4.12'
androidTestCompile 'com.squareup.retrofit:retrofit-mock:1.9.0'
androidTestCompile 'com.squareup.assertj:assertj-android:1.1.0'
androidTestCompile 'com.squareup.spoon:spoon-client:1.2.0'

测试失败:

@RunWith(AndroidJUnit4.class)
@SmallTest
public class PushNotificationTests {

    @Test
    public void testSomething(){

        // do things...
        MyIdlingResource eventBusIdlingResource = new MyIdlingResource();
        registerIdlingResources(eventBusIdlingResource);

        Order.Status status = Order.getCurrentObservable().toBlocking().first().getStatus();
        assertThat(status).isEqualTo(Order.Status.PROGRESS);   // Fail,

        unregisterIdlingResources(eventBusIdlingResource)
    }

}

尝试但不工作:

@RunWith(AndroidJUnit4.class)
@SmallTest
public class PushNotificationTests {

    @Test
    public void testSomething(){

        // do things...

        MyIdlingResource eventBusIdlingResource = new MyIdlingResource();
        registerIdlingResources(eventBusIdlingResource);

        // Wait manually?
        int sleeps = 0;
        while(!eventBusIdlingResource.isIdleNow() || sleeps < 10){
            sleep(100);
            sleeps++;
        }

        Order.Status status = Order.getCurrentObservable().toBlocking().first().getStatus();
        assertThat(status).isEqualTo(Order.Status.PROGRESS);   // Fail,

        unregisterIdlingResources(eventBusIdlingResource)
    }

}

Answer 1

在检查 UI 状态之前，我有同样的要求强制 Espresso 处于空闲状态。对我有用的是添加一个始终为真的 View 断言，因为 Espresso 在执行它之前会等待空闲状态。

onView(isRoot()).check(matches(anything()));