java-使用Robolectric时如何监视活动

我是Android的新手,我正在与Robolectric一起进行单元测试.
我正面临以下问题.

我有一个要测试的活动.

MainActivity.java

public class MainActivity extends ActionBarActivity
        implements NavigationDrawerFragment.NavigationDrawerCallbacks {

    private NavigationDrawerFragment mNavigationDrawerFragment;

    @Override
    protected void onCreate (Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mNavigationDrawerFragment = (NavigationDrawerFragment)
                getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);

        mNavigationDrawerFragment.setUp(
                R.id.navigation_drawer,
                (DrawerLayout) findViewById(R.id.drawer_layout));
    }

    @Override
    public void onNavigationDrawerItemSelected (int position) {
        ...
    }
}

这是测试类：

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class)
public class MainActivityTests {

    private ActivityController<MainActivity> controller;
    private MainActivity activity;
    private MainActivity spy;

    @Test
    public void onCreate_shouldStartNavigationDrawerFragment () {

        controller = Robolectric.buildActivity(MainActivity.class);
        activity = controller.get();
        assertThat(activity).isNotNull();

        spy = spy(activity);
        spy.onCreate(null);

        verify(spy).onCreate(null);
    }
}

但是我收到以下异常：

java.lang.IllegalStateException：在spy.onCreate(null)行的onCreate()之前,Activities无法使用系统服务.

我已经搜寻了几个小时,并且尝试了几种变通方法(盲目),但均未成功.可以请任何人指导我吗？

解决方法:

这就是我的诀窍.我先使用attach()进行活动监视.经过Robolectric 3.0测试

private MainActivity spyActivity;

@Before
public void setUp(){

    MainActivity activity = Robolectric.buildActivity(MainActivity.class).attach().get();
    spyActivity = spy(activity);

    spyActivity.onCreate(null);

}

标签：unit-testing,android-testing,robolectric,java,android
来源： https://codeday.me/bug/20191120/2042623.html