我正在尝试使用espresso构建测试，以检查单击按钮时是否创建了服务。

Mainactivity代码：

public class Mainactivity ... {

    // Monitors the state of the connection to the service.
        private final ServiceConnection mServiceConnection = new ServiceConnection() {

            @Override
            public void onServiceConnected(ComponentName name,IBinder service) {
                LocalBinder binder = (LocalBinder) service;
                mService = binder.getService();
                mBound = true;
            }

            @Override
            public void onServiceDisconnected(ComponentName name) {
                mService = null;
                mBound = false;
            }
        };

    //onCreate() doesn't matter,nothing related with service

    @Override
        protected void onStart() {
            super.onStart();
            //...
            mRequestLocationUpdatesButton = findViewById(R.id.request_location_updates_button);

            mRequestLocationUpdatesButton.setOnClicklistener(this);

            bindService(new Intent(this,LocationUpdatesService.class),mServiceConnection,Context.BIND_AUTO_CREATE);
        }

        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.request_location_updates_button) {
                if (!checkPermissions()) {
                    requestPermissions();
                } else {
                    mService.requestLocationUpdates();
                }
        }
}

我如何报名参加考试？我知道如何检查是否创建了另一个活动，但是我不知道如何控制是否创建了服务。

测试类：

@RunWith(AndroidJUnit4.class)
public class CheckactivityBehaviour {

    @Rule
    public activityScenarioRule<Mainactivity> activityMain
            = new activityScenarioRule<Mainactivity>(Mainactivity.class);

    @Test
    public void performClick() {
        onView(withId(R.id.request_location_updates_button)).perform(click());
        //on click this button service is started
    }
}