测试Activity返回预期结果

Question

我有以下活动:

package codeguru.startactivityforresult;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class ChildActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.child);

        this.resultButton = (Button) this.findViewById(R.id.result_button);
        this.resultButton.setOnClickListener(onResult);
    }

    private View.OnClickListener onResult = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent result = new Intent();
            result.putExtra(ChildActivity.this.getString(R.string.result), ChildActivity.this.getResources().getInteger(R.integer.result));
            ChildActivity.this.setResult(RESULT_OK, result);
            ChildActivity.this.finish();
        }
    };
    private Button resultButton = null;
}

以下JUnit测试:

package codeguru.startactivityforresult;

import android.app.Activity;
import android.test.ActivityInstrumentationTestCase2;
import android.test.UiThreadTest;
import android.widget.Button;
import junit.framework.Assert;

public class ChildActivityTest extends ActivityInstrumentationTestCase2<ChildActivity> {

    public ChildActivityTest() {
        super(ChildActivity.class);
    }

    @Override
    public void setUp() throws Exception {
        super.setUp();

        this.setActivityInitialTouchMode(false);

        this.activity = this.getActivity();
        this.resultButton = (Button) this.activity.findViewById(R.id.result_button);
    }

    @Override
    public void tearDown() throws Exception {
        super.tearDown();
    }

    @UiThreadTest
    public void testResultButtonOnClick() {
        Assert.assertTrue(this.resultButton.performClick());
        Assert.fail("How do I check the returned result?");
    }
    private Activity activity;
    private Button resultButton;
}

如何确保单击按钮设置正确的结果(通过调用setResult())将返回到启动此活动的任何活动startActivityForResult()？

Answer 1

使用当前Activity实现的问题,即通过单击ChildActivity中的按钮设置结果然后立即销毁活动,我们在ChildActivityTest中没有太多可以用来测试结果相关的东西.

相关问题的答案测试onActivityResult()显示了如何在MainActivityTest中单独测试startActivityForResult()和/或onActivityResult().通过独立意味着MainActivityTest不依赖于ChildActivity的交互,检测将捕获ChildActivity创建并立即终止它然后返回一个现成的模拟ActivityResult,因此单元测试 MainActivity.

如果您不希望检测中断并返回模拟ActivityResult,则可以让ChildActivity继续运行,然后在ChildActivity中模拟交互,并将真实的ActivityResult返回给MainActivity.如果您的MainActivity启动ChildActivity获得结果然后更新TextView,以测试整个端到端的交互/合作,请参阅下面的示例代码:

public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
  ... ...

  public void testStartActivityForResult() {
    MainActivity mainActivity = getActivity();
    assertNotNull(activity);

    // Check initial value in TextView:
    TextView text = (TextView) mainActivity.findViewById(com.example.R.id.textview1);
    assertEquals(text.getText(), "default vaule");

    try {
      Thread.sleep(2000);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }

    // Create an ActivityMonitor that monitor ChildActivity, do not interrupt, do not return mock result:
    Instrumentation.ActivityMonitor activityMonitor = getInstrumentation().addMonitor(ChildActivity.class.getName(), null , false);

    // Simulate a button click in MainActivity that start ChildActivity for result:
    final Button button = (Button) mainActivity.findViewById(com.example.R.id.button1);
    mainActivity.runOnUiThread(new Runnable() {
      public void run() {
        button.performClick();
      }
    });

    try {
      Thread.sleep(2000);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }

    getInstrumentation().waitForIdleSync();
    ChildActivity childActivity = (ChildActivity) getInstrumentation().waitForMonitorWithTimeout(activityMonitor, 5);
    // ChildActivity is created and gain focus on screen:
    assertNotNull(childActivity);

    // Simulate a button click in ChildActivity that set result and finish ChildActivity:
    final Button button2 = (Button) childActivity.findViewById(com.example.R.id.button1);
    childActivity.runOnUiThread(new Runnable() {
      public void run() {
        button2.performClick();
      }
    });

    try {
      Thread.sleep(2000);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }

    getInstrumentation().waitForIdleSync();
    // TextView in MainActivity should be changed:
    assertEquals(text.getText(), "default value changed");
  }

  ... ...
}

我在这里添加了三个Thread.sleep()调用,以便您可以在运行JUnit Test时看到按钮单击模拟.正如你在这里看到的,独立的ChildActivityTest不足以测试整个合作,我们实际上是通过MainActivityTest间接测试ChildActivity.setResult(),因为我们需要从一开始就模拟整个交互.