Java 从@UiThreadTest调用waitForMonitorWithTimeout()
为了说明我最近在为Android应用程序编写JUnit测试时遇到的问题,我编写了一个包含两个活动的简单示例,Java 从@UiThreadTest调用waitForMonitorWithTimeout(),java,android,unit-testing,junit,instrumentation,Java,Android,Unit Testing,Junit,Instrumentation,为了说明我最近在为Android应用程序编写JUnit测试时遇到的问题,我编写了一个包含两个活动的简单示例,StartActivityForResult和ChildActivity。前者包含一个文本视图(用于显示目的)和一个按钮,而后者仅包含一个按钮。StartActivityForResult中按钮的onClickListener仅启动ChildActivity的一个实例 private View.OnClickListener onStart = new View.OnClickListen
StartActivityForResult
和ChildActivity
。前者包含一个文本视图
(用于显示目的)和一个按钮
,而后者仅包含一个按钮
。StartActivityForResult
中按钮的onClickListener
仅启动ChildActivity
的一个实例
private View.OnClickListener onStart = new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d(TAG, "Start button clicked");
Intent intent = new Intent(StartActivityForResult.this, ChildActivity.class);
StartActivityForResult.this.startActivityForResult(intent, R.id.child_request);
}
};
现在我想用JUnit测试这个方法。因此,我编写了以下测试:
package codeguru.startactivityforresult;
import android.app.Activity;
import android.app.Instrumentation;
import android.content.Intent;
import android.test.ActivityInstrumentationTestCase2;
import android.test.UiThreadTest;
import android.util.Log;
import android.widget.Button;
import android.widget.TextView;
import junit.framework.Assert;
public class StartActivityForResultTest extends ActivityInstrumentationTestCase2<StartActivityForResult> {
public StartActivityForResultTest() {
super(StartActivityForResult.class);
}
@Override
public void setUp() throws Exception {
super.setUp();
Log.d(TAG, "setUp()");
this.setActivityInitialTouchMode(false);
this.activity = this.getActivity();
this.resultText = (TextView) this.activity.findViewById(R.id.result_text);
this.startButton = (Button) this.activity.findViewById(R.id.start_button);
Intent data = new Intent();
data.putExtra(this.activity.getString(R.string.result), RESULT);
Instrumentation.ActivityResult result = new Instrumentation.ActivityResult(Activity.RESULT_OK, data);
this.childMonitor = new Instrumentation.ActivityMonitor(ChildActivity.class.getName(), result, true);
this.getInstrumentation().addMonitor(this.childMonitor);
}
@Override
public void tearDown() throws Exception {
this.activity.finish();
super.tearDown();
}
@UiThreadTest
public void testStartButtonOnClick() {
Assert.assertTrue(this.startButton.performClick());
Activity childActivity = this.getInstrumentation().waitForMonitorWithTimeout(this.childMonitor, TIME_OUT);
Assert.assertNotNull(childActivity); // <------ Line 51
Button resultButton = (Button) childActivity.findViewById(R.id.result_button);
Assert.assertTrue(resultButton.performClick());
Assert.assertEquals(Integer.toString(RESULT), this.resultText.getText().toString());
}
private Activity activity = null;
private TextView resultText = null;
private Button startButton = null;
private Instrumentation.ActivityMonitor childMonitor = null;
private static final int TIME_OUT = 5 * 1000; // 5 seconds
private static final int RESULT = 69;
private static final String TAG = StartActivityForResultTest.class.getName();
}
据我所知,调用
startButton.performClick()
不会启动ChildActivity
的实例。给出了什么?如中所示,问题是我正在UI线程上调用waitForMonitorWithTimeout()
。在意识到这一点之后,它当然是完全有意义的,因为waitForMonitorWithTimeout()
等待UI线程完成某些操作(即显示活动的UI)。但是,通过在UI线程上调用它,我延迟了该操作的发生。如中所示,问题在于我在UI线程上调用了waitForMonitorWithTimeout()
。在意识到这一点之后,它当然是完全有意义的,因为waitForMonitorWithTimeout()
等待UI线程完成某些操作(即显示活动的UI)。但是,通过在UI线程上调用它,我延迟了该操作的发生。在Android JUnit测试中模拟按钮单击的正确方法是调用button.performClick()代码>在应用程序的UI线程上,请参见本文中的示例。我不会简单地调用Assert.assertTrue(this.startButton.performClick())
将导致按钮实际被单击。@yorkw该测试用例用@UiThreadTestCase
注释,因此它自动在UI线程上运行。真正的问题是,我还在UI线程上调用waitForMonitorWithTimeout()
代码>在应用程序的UI线程上,请参见本文中的示例。我不会简单地调用Assert.assertTrue(this.startButton.performClick())
将导致按钮实际被单击。@yorkw该测试用例用@UiThreadTestCase
注释,因此它自动在UI线程上运行。真正的问题是,我还在UI线程上调用了waitForMonitorWithTimeout()
。拍得不错,官方API文档中没有很好地记录这些内容。@yorkw我对Android API文档总体上没有说明这样的细节感到失望。这有点令人沮丧-(拍摄得不错,官方API文档中没有很好地记录这些内容。@约克我对Android API文档总体上没有说明这样的细节感到失望。这有点令人沮丧。)-(
codeguru@trolloc:~/src/java/stackoverflow/sscce/StartActivityForResult/test$ adb logcat -c
codeguru@trolloc:~/src/java/stackoverflow/sscce/StartActivityForResult/test$ adb shell am instrument -w -e class codeguru.startactivityforresult.StartActivityForResultTest codeguru.startactivityforresult.tests/android.test.InstrumentationTestRunner
codeguru.startactivityforresult.StartActivityForResultTest:
Failure in testStartButtonOnClick:
junit.framework.AssertionFailedError
at codeguru.startactivityforresult.StartActivityForResultTest.testStartButtonOnClick(StartActivityForResultTest.java:51)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
at android.test.InstrumentationTestCase.access$000(InstrumentationTestCase.java:36)
at android.test.InstrumentationTestCase$2.run(InstrumentationTestCase.java:189)
at android.app.Instrumentation$SyncRunnable.run(Instrumentation.java:1602)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Test results for InstrumentationTestRunner=.F
Time: 3.248
FAILURES!!!
Tests run: 1, Failures: 1, Errors: 0
codeguru@trolloc:~/src/java/stackoverflow/sscce/StartActivityForResult/test$ adb logcat -d codeguru.startactivityforresult.StartActivityForResultTest:D codeguru.startactivityforresult.StartActivityForResult:D codeguru.startactivityforresult.ChildActivity:D *:S
D/codeguru.startactivityforresult.StartActivityForResultTest( 954): setUp()
D/codeguru.startactivityforresult.StartActivityForResult( 954): onCreate()
D/codeguru.startactivityforresult.StartActivityForResult( 954): Start button clicked
layne@trolloc:~/src/java/stackoverflow/sscce/StartActivityForResult/test$