Android 单元测试 - startActivity() 使应用程序/测试崩溃

Question

我正在使用 Espresso 和 Mockito 测试 Android 应用程序并扩展 ActivityInstrumentationTestCase2UI 测试效果很好，但我有一个按钮，当按下它时，onClick 方法上的代码会触发 startActivity(Intent)，然后使应用程序崩溃并进行测试。

在真正的 Activity 上我有这个 onClick 方法

    public void onContinueButtonClicked(View v)
    {
        Intent intent = new Intent(CurrentActivity.this, NextActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(intent);
    }

在测试类中，我调用该方法使用

onView(withId(R.id.btn_continue)).perform(click());

一旦 startActivity 触发，我就会得到很多这样的行:

I/MonitoringInstrumentation: Unstopped activity count: 1

在日志上，然后应用程序崩溃了

崩溃:

03-09 14:39:41.654 21469-21505/com.example I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:41.704 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:41.754 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:41.804 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:41.854 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:41.905 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:41.955 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:42.005 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:42.055 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:42.105 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:42.156 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:42.206 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:42.256 21469-21505/com.example  I/MonitoringInstrumentation: Unstopped activity count: 1
03-09 14:39:42.314 21469-21505/com.example  E/THREAD_STATE:   Thread[main,5,main]
                                                                       android.os.MessageQueue.nativePollOnce(Native Method)
                                                                       android.os.MessageQueue.next(MessageQueue.java:323)
                                                                       android.os.Looper.loop(Looper.java:135)
                                                                       android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                       java.lang.reflect.Method.invoke(Native Method)
                                                                       com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                       com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

                                                                     Thread[Thread-904,5,main]
                                                                       java.lang.Object.wait(Native Method)
                                                                       java.lang.Thread.parkFor$(Thread.java:1220)
                                                                       sun.misc.Unsafe.park(Unsafe.java:299)
                                                                       java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
                                                                       java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2013)
                                                                       java.util.concurrent.PriorityBlockingQueue.take(PriorityBlockingQueue.java:510)
                                                                       com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:92)

                                                                     Thread[FinalizerDaemon,5,system]
                                                                       java.lang.Object.wait(Native Method)
                                                                       java.lang.Object.wait(Object.java:423)
                                                                       java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:101)
                                                                       java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:72)
                                                                       java.lang.Daemons$FinalizerDaemon.run(Daemons.java:185)
                                                                       java.lang.Thread.run(Thread.java:818)

                                                                     Thread[Queue,10,main]
                                                                       java.lang.Object.wait(Native Method)
                                                                       java.lang.Thread.parkFor$(Thread.java:1220)
                                                                       sun.misc.Unsafe.park(Unsafe.java:299)
                                                                       java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
                                                                       java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2013)
                                                                       java.util.concurrent.PriorityBlockingQueue.take(PriorityBlockingQueue.java:510)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.performOperation(DependencyPriorityBlockingQueue.java:197)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.get(DependencyPriorityBlockingQueue.java:236)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.take(DependencyPriorityBlockingQueue.java:65)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.take(DependencyPriorityBlockingQueue.java:46)
                                                                       java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1038)
                                                                       java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1098)
                                                                       java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                                       java.lang.Thread.run(Thread.java:818)

                                                                     Thread[Queue,10,main]
                                                                       java.lang.Object.wait(Native Method)
                                                                       java.lang.Thread.parkFor$(Thread.java:1220)
                                                                       sun.misc.Unsafe.park(Unsafe.java:299)
                                                                       java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
                                                                       java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2013)
                                                                       java.util.concurrent.PriorityBlockingQueue.take(PriorityBlockingQueue.java:510)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.performOperation(DependencyPriorityBlockingQueue.java:197)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.get(DependencyPriorityBlockingQueue.java:236)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.take(DependencyPriorityBlockingQueue.java:65)
                                                                       io.fabric.sdk.android.services.concurrency.DependencyPriorityBlockingQueue.take(DependencyPriorityBlockingQueue.java:46)
                                                                       java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1038)
                                                                       java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1098)
                                                                       java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                                       java.lang.Thread.run(Thread.java:818)

                                                                     Thread[Queue,10,main]
                                                                       java.lang.Object.wait(Native Method)
                                                                       java.lang.Thread.parkFor$(Thread.java:1220)
                                                                       sun.misc.Unsafe.park(Unsafe.java:299)
                                                                       java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
                                                                       java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObjec

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'rx.Subscription rx.Observable.subscribe(rx.functions.Action1, rx.functions.Action1)' on a null object reference
at com.example.activities.MainActivity.onCreate(MainActivity.java:52)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.support.test.runner.MonitoringInstrumentation.callActivityOnCreate(MonitoringInstrumentation.java:532)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
... 23 more

Answer 1

所以，回答我自己的问题。如果有人需要此信息。没有办法 catch Context.startActivity();Activity 将启动，为防止崩溃，您需要模拟新 Activity 中的所有方法。