如何为Android体系结构组件生命周期事件添加单元测试? [英] How can I add unit test for android architecture components life cycle event?

问题描述

我尝试为支持架构组件生命周期事件的功能添加单元测试.为了支持生命周期事件，我为函数添加了@OnLifecycleEvent批注，该事件发生时我想做一些事情.

I tried to add a unit test for my function which supports architecture components lifecycle event. To support lifecycle event, I added the @OnLifecycleEvent annotation for my function which I want to do something when that event occurred.

一切正常，但是我想为该功能创建一个单元测试，以检查发生预期事件时我的功能是否运行.

Everything is working as expected but I want to create a unit test for that function to check my function running when the intended event occurred.

 public class CarServiceProvider implements LifecycleObserver {

    public void bindToLifeCycle(LifecycleOwner lifecycleOwner) {
        lifecycleOwner.getLifecycle().addObserver(this);
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void onClear() {
       Log.i("CarServiceProvider", "onClear called");
    }
 }

我尝试模拟LifecycleOwner并创建新的LifecycleRegistery来更改生命周期观察器的状态，但我没有这样做.

I tried to mock LifecycleOwner and create new LifecycleRegistery to change the state of lifecycle observer but I didn't do.

如何更改状态更改后调用的onClear()函数?

How can I test my onClear() function called when state changed ?

推荐答案

尽管我不是一个忠实的粉丝，但我还是会选择 Robolectric 利用 ActivityController 来实现.

Despite of I am not a big fan, I would go with Robolectric making use of ActivityController to achieve this.

鉴于观察者模式的可观察性"应用于以下事实 Android Lifecycle工作流是活动"，片段"……应用程序上下文是必须的，我们需要以某种方式将其引入我们的测试场景.

Given the fact that the "Observables" of the Observer pattern applied in Android Lifecycle workflow are Activities, Fragments... An application context is a must and we need somehow bring it to our test scenario.

我通过这样做达到了预期的结果

I achieved the expected result by doing this

build.gradle

testCompile "org.robolectric:robolectric:3.5.1"

CarServiceProviderTest.java

@RunWith(RobolectricTestRunner.class)
@Config(constants = BuildConfig.class)
public class CarServiceProviderTest {

    @Test
    public void shouldFireOnClear(){

        //Grab the Activity controller
        ActivityController controller = Robolectric.buildActivity(JustTestActivity.class).create().start();
        AppCompatActivity activity = (AppCompatActivity) controller.get();

        //Instanciate our Observer
        CarServiceProvider carServiceProvider = new CarServiceProvider();
        carServiceProvider.bindToLifeCycle(activity);

        //Fire the expected event
        controller.stop();

        //Assert
        Assert.assertTrue(carServiceProvider.wasFired);
    }
}

CarServiceProvider.java

public class CarServiceProvider implements LifecycleObserver {

    public boolean wasFired;

    public void bindToLifeCycle(LifecycleOwner lifecycleOwner) {
        lifecycleOwner.getLifecycle().addObserver(this);
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void onClear() {
        wasFired = true;
    }
}

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