当运行AndroidJUnitRunner时,ActivityUnitTestCase引发RuntimeException

我正在尝试将 Espresso 2.0’s AndoridJUnitRunner与ActivityUnitTestCase集成.不过,我的测试在 startActivity() tries to initialize mMockParent = new MockParent()时崩溃了.

这是我做的：

使用Intellij 14 CE创建一个新项目,并对build.gradle进行一些更改.

android{
    defaultConfig {
        applicationId "com.noob.testing"
        minSdkVersion 9
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}
dependencies {
    compile filetree(dir: 'libs',include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.+'

    androidTestCompile('org.mockito:mockito-core:1.9.5')
    androidTestCompile('com.google.dexmaker:dexmaker:1.2')
    androidTestCompile('com.google.dexmaker:dexmaker-mockito:1.2')

    androidTestCompile('com.android.support.test.espresso:espresso-core:2.0')
    androidTestCompile('com.android.support.test:testing-support-lib:0.1')
}

编写一个JUnit4风格的单元测试.

@RunWith(AndroidJUnit4.class)
public class MainActivityJUnit4Test extends ActivityUnitTestCase<MainActivity> {
    public MainActivityJUnit4test() {
        super(MainActivity.class);
    }

    MainActivity activity;

    @Before
    public void setup() throws Exception {
        injectInstrumentation(InstrumentationRegistry.getInstrumentation());
        super.setUp();
        ContextThemeWrapper context = new ContextThemeWrapper(getInstrumentation().getTargetContext(),R.style.AppTheme);
        setActivityContext(context);
        activity = startActivity(new Intent(Intent.ACTION_MAIN),null,null);
    }

    @Test
    public void baseCase() {
        TextView tv = (TextView) activity.findViewById(R.id.tv);
        Assert.assertEquals("Hello World",tv.getText());

    }
}

运行测试,获取堆栈跟踪.

junit.framework.AssertionFailedError
at junit.framework.Assert.fail(Assert.java:48)
at junit.framework.Assert.assertTrue(Assert.java:20)
at junit.framework.Assert.assertNotNull(Assert.java:218)
at junit.framework.Assert.assertNotNull(Assert.java:211)
at android.test.ActivityUnitTestCase.startActivity(ActivityUnitTestCase.java:147)
at com.sdchang.testing.MainActivityJUnit4Test.setup(MainActivityJUnit4Test.java:32)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runners.Suite.runchild(Suite.java:128)
at org.junit.runners.Suite.runchild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:270)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)

这个堆栈跟踪实际上是一个反思

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

发生在startActivity() tries to initialize mMockParent = new MockParent()：

ComponentName cn = new ComponentName(mActivityClass.getPackage().getName(),mActivityClass.getName());
            intent.setComponent(cn);
            ActivityInfo info = new ActivityInfo();
            CharSequence title = mActivityClass.getName();
            mMockParent = new MockParent();
            String id = null;

我还缺少什么让AndroidJUnitRunner使用ActivityUnitTestCase？任何帮助将不胜感激.

解决方法

我的头撞在墙上,窗户和各种家具后,终于让我的测试工作了！

从a response on its issue tracker起,我了解到,不能从仪器线程创建新的处理程序.这意味着必须在UI线程中调用startActivity().这导致3个解决方案.

使用仪器的runOnMainSync()

getInstrumentation().runOnMainSync(new Runnable() {
    @Override
    public void run() {
        activity = startActivity(new Intent(Intent.ACTION_MAIN),null);
    }
});

2.创建自己的基类,扩展ActivityUnitTestCase并覆盖startActivity

@Override
protected T startActivity(final Intent intent,final Bundle savedInstanceState,final Object lastNonConfigurationInstance) {
    return startActivityOnMainThread(intent,savedInstanceState,lastNonConfigurationInstance);
}

private T startActivityOnMainThread(final Intent intent,final Object lastNonConfigurationInstance) {
    final atomicreference<T> activityRef = new atomicreference<>();
    final Runnable activityRunnable = new Runnable() {
        @Override
        public void run() {
            activityRef.set(YourBaseActivityUnitTestCase.super.startActivity(
                    intent,lastNonConfigurationInstance));
        }
    };

    if (Looper.myLooper() != Looper.getMainLooper()) {
        getInstrumentation().runOnMainSync(activityRunnable);
    } else {
        activityRunnable.run();
    }

    return activityRef.get();
}

3.如果在测试方法中调用startActivity(),并且整个测试可以在主线程上运行,则可以使用@UiThreadTest简单地注释测试方法.

在我的测试中,我已经尝试了所有3种解决方案,但只有1& 2会奏效