我想为重新创建活动编写测试。旋转是可选的。
我希望使用Google赞助的最新版本测试框架"Blessed"编写测试。我是测试编写的新手,因此我想学习基本的、主流的、得到良好支持的工具。在我掌握基础知识之后,任何第三方测试框架都可以。而且由于我想测试非常基础、频繁发生的情况,所以基本工具应该足够了,对吧?
最小化测试代码:
public class MainActivity extends AppCompatActivity {
static int creationCounter = 0;
Integer instanceId;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
++creationCounter;
instanceId = new Integer(creationCounter);
Log.d("TEST", "creating activity " + this + ", has id " + instanceId);
}
}
还有测试类:
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
@Rule
public ActivityTestRule<MainActivity> mActivityTestRule = new ActivityTestRule<>(MainActivity.class);
@Test
public void useAppContext() throws Exception {
MainActivity activity1 = mActivityTestRule.getActivity();
int act1 = activity1.instanceId.intValue();
int counter1 = MainActivity.creationCounter;
assertEquals(1, counter1);
assertEquals(1, act1);
Log.d("TEST", "requesting rotation");
// method 1
activity1.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
// method 2 //https://gist.github.com/nbarraille/03e8910dc1d415ed9740#file-orientationchangeaction-java
// onView(isRoot()).perform(orientationLandscape());
getInstrumentation().waitForIdleSync(); // I thought this should suffice
// How to do this?
//somehowRefreshActivityInstanceInsideTestRule();
MainActivity activity2 = mActivityTestRule.getActivity();
int act2 = activity2.instanceId.intValue();
int counter2 = MainActivity.creationCounter;
Log.d("TEST", "newly acquired activity " + activity2 + " has id " + act2 + "/" + counter2);
assertEquals(2, counter2);
assertEquals(2, act2);
}
}
以上代码(无论是method1还是2)都会产生logcat:
D/ActivityTestRule: Launching activity example.com.rotationtest.MainActivity
D/TEST: creating activity example.com.rotationtest.MainActivity@47404a3, has id 1
D/TEST: requesting rotation
D/TEST: creating activity example.com.rotationtest.MainActivity@169887e, has id 2
D/TEST: newly acquired activity example.com.rotationtest.MainActivity@47404a3 has id 1/2
I/TestRunner: failed: useAppContext(example.com.rotationtest.ExampleInstrumentedTest)
I/TestRunner: ----- begin exception -----
I/TestRunner: java.lang.AssertionError: expected:<2> but was:<1>
我的诊断,如有错误请纠正:
- activity1.setRequestedOrientation会在其他线程中创建新的Activity。我希望它能正确地接收Bundle。
- getInstrumentation().waitForIdleSync()会导致测试等待新的Activity被创建。
- mActivityTestRule.getActivity()仍然返回旧的Activity实例。
- 我需要一种方法来刷新测试规则中保存的Activity实例,并释放先前保存的实例。
我在旧版本的测试框架中找到了答案:Instrumentation test for Android - How to receive new Activity after orientation change?
mActivity.setRequestedOrientation(
ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
mActivity.finish();
setActivity(null);
mActivity = getActivity();
getInstrumentation().waitForIdleSync();
但我不知道如何将其翻译成新版本。
编辑:
上述两种方法都会使活动保持在已销毁的状态:assertFalse(mActivityTestRule.getActivity().isDestroyed()); 失败。
我找到了另一种方法(使用Testing Support Library销毁和重启Activity),它会重新创建活动实例,但不会通过onSaveInstanceState保存其状态。