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AsyncTask.onPostExecute () is never called in ServiceTestCase

I am writing unit test for a service using ServiceTestCase.

The service basically does AsyncTask, which does some work, and then does something else in onPostExecute ().

The service works as expected when I start and debug it on a (virtual) device.

But in a test extending ServiceTestCase, I only get into doInBackground (). When methods return, onPostExecute () is never called. I give a sleep () test, so AsyncTask has time to complete its work.

This is a simplified service:

public class ServiceToTest extends Service {
    private AtomicBoolean busy = new AtomicBoolean(false);

    @Override
    public IBinder onBind(final Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(final Intent intent, final int flags,
        final int startId) {
        this.handleCommand();
        return START_NOT_STICKY;
    }

    /**
    * Workaround for http://code.google.com/p/android/issues/detail?id=12117
    */
    @Override
    public void onStart(final Intent intent, final int startId) {
        this.handleCommand();
    }

    public void handleCommand() {
        new TaskToTest().execute();
    }

    public boolean isBusy() {
        return busy.get();
    }

    private class TaskToTest extends AsyncTask<Boolean, Void, TestInfo> {
        @Override
        protected void onPreExecute() {
            busy.set(true);
        }

        @Override
        protected TestInfo doInBackground(final Boolean... args) {
            return null;
        }

        @Override
        protected void onPostExecute(final TestInfo info) {
            busy.set(false);
        }
    }
}

This is a test for him:

public class ServiceTest extends ServiceTestCase<ServiceToTest> {
    public ServiceTest() {
        super(ServiceToTest.class);
    }

    public void testIsBusy() throws InterruptedException {
        startService(new Intent("this.is.the.ServiceToTest"));  
        ServiceToTest serviceToTest = this.getService();
        assertTrue(serviceToTest.isBusy());
        Thread.sleep(10000);
        assertFalse(serviceToTest.isBusy());
    }
}

I believe the environment provided by ServiceTestCase is somewhat limited, so this does not work, but is there anything I can do to make it work?

Cheers, Torsten

+3
4

, , "", Looper.prepare() Looper.loop(). .

+1

, , dmon.

:

public class ServiceTest extends ServiceTestCase {

public ServiceTest() {
    super(ServiceToTest.class);
}

public void testIsBusy() throws InterruptedException {

    // Starts the service and asserts that onPreExecute() was called
    ServiceTestThread serviceTestThread = new ServiceTestThread();
    serviceTestThread.start();

    // Wait for the service to start and complete doInBackground()
    // TODO Implement something smarter than this...
    Thread.sleep(1000);

    // Assert that onPostExecute() was called
    assertFalse(serviceTestThread.serviceToTest.isBusy());

}

private class ServiceTestThread extends Thread {

    ServiceToTest serviceToTest;

    public void run() {
        Looper.prepare();

        startService(new Intent("this.is.the.ServiceToTest"));

        serviceToTest = getService();

        assertTrue(serviceToTest.isBusy());

        Looper.loop();
    }

}

} >

, ServiceTestThread , .

+1

, - , Tortens .

    private synchronized boolean getWaitFlag()
    {
        return _waitFlag;
    }

    private boolean _waitFlag;

    private synchronized void setWaitFlag(boolean value)
    {
        _waitFlag = value;
    }

    private void waitForCompletionFlag() throws InterruptedException
    {
        Calendar cal = Calendar.getInstance();
        while (getWaitFlag() == false)
        {
            Thread.sleep(10);
            if (Calendar.getInstance().getTimeInMillis() - cal.getTimeInMillis() > 1000) // Wait at most 1 second
            {
                Log.e("timeout", "timed out waiting to complete task");
                break;
            }
        }
    }

private abstract class EmulatedUI extends Thread
    {
        public abstract void doWork();

        public void run()
        {
            Looper.prepare();
            doWork();
            Looper.loop();
        }
    }

public void testSomething() throws InterruptedException
{
    EmulatedUI thread = new EmulatedUI() {

        @Override
        public void doWork()
        {
            _objectToTest.someAsyncCall(new WorkCompletedCallback() {

                        @Override
                        public void onComplete()
                        {
                                   // could possibly assert things here
                            setWaitFlag(true);
                        }
                    });

        }
    };
    thread.start();
    waitForCompletionFlag();
    // assert things here since you know the async task has completed.
}
0

, ui. startService ui.

public void testIsBusy() throws Exception {
  final CountDownLatch latch = new CountDownLatch(1);

  new Handler(Looper.getMainLooper()).post(new Runnable() {
    @Override
    public void run() {
      startService(new Intent("this.is.the.ServiceToTest"));  
      ServiceToTest serviceToTest = this.getService();
      assertTrue(serviceToTest.isBusy());
      Thread.sleep(10000);
      assertFalse(serviceToTest.isBusy());
      latch.countDown();
    }
  });

  latch.await(5, TimeUnit.SECONDS);
}
0

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