Testing onActivityResult()

Question

I have the following Activity:

package codeguru.startactivityforresult;

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

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

        this.startButton = (Button) this.findViewById(R.id.start_button);
        this.startButton.setOnClickListener(onStart);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        int result = data.getIntExtra(StartActivityForResult.this.getString(R.string.result), -1);
        String msg = "requestCode=" + requestCode + ", resultCode=" + resultCode + ", result=" + result;
        Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
    }

    private View.OnClickListener onStart = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(StartActivityForResult.this, ChildActivity.class);

            StartActivityForResult.this.startActivityForResult(intent, R.id.child_request);
        }
    };
    private Button startButton = null;
}

And the following JUnit test:

package codeguru.startactivityforresult;

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

public class StartActivityForResultTest extends ActivityInstrumentationTestCase2<StartActivityForResult> {

    public StartActivityForResultTest() {
        super(StartActivityForResult.class);
    }

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

        this.setActivityInitialTouchMode(false);

        this.activity = this.getActivity();
        this.startButton = (Button) this.activity.findViewById(R.id.start_button);
    }

    @Override
    public void tearDown() throws Exception {
        this.activity.finish();

        super.tearDown();
    }

    @UiThreadTest
    public void testStartButtonOnClick() {
        Assert.assertTrue(this.startButton.performClick());

        Instrumentation.ActivityResult result = new Instrumentation.ActivityResult(Activity.RESULT_OK, null);
        Assert.assertNotNull(result);

        Instrumentation.ActivityMonitor am = new Instrumentation.ActivityMonitor(ChildActivity.class.getName(), result, true);
        Assert.assertNotNull(am);

        Activity childActivity = this.getInstrumentation().waitForMonitorWithTimeout(am, TIME_OUT);
        Assert.assertNotNull(childActivity);

        Assert.fail("How do I check that StartActivityForResult correctly handles the returned result?");
    }
    private Activity activity = null;
    private Button startButton = null;
    private static final int TIME_OUT = 5 * 1000; // 5 seconds
}

As you can see, I figured out how to mock up a result using Instrumentation.ActivityResult and Instrumentation.ActivityMonitor. How do I check that StartActivityForResult.onActivityResult() properly handles this result?

Answer 1

For testing onActivityResult() in your test class, all you need to do is:

1. Create an ActivityMonitor which catching ChildActivity creation and retuning the mock ActivityResult.
2. Simulating the button click which start the ChildActivity for result.
3. Do some assertion on status and the mock ActivityResult.

Sample StartActivityForResult:

public class StartActivityForResult extends Activity {
  private boolean activityResultIsReturned = false;
  private String activityResult = null;

  ... ...

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    activityResultIsReturned = true;
    activityResult = data.getStringExtra("result");

    ... ...
  }

  ... ...
}

Sample StartActivityForResultTest:

public class StartActivityForResultTest extends ActivityInstrumentationTestCase2<StartActivityForResult> {
  ... ...

  public void testOnActivityResult() {
    // Get current Activity and check initial status:
    StartActivityForResult myActivity = getActivity();
    assertFalse(myActivity.getActivityResultIsReturned());
    assertNull(myActivity.getActiityResult());

    // Mock up an ActivityResult:
    Intent returnIntent = new Intent();
    returnIntent.putExtra("result", "This is the result");
    Instrumentation.ActivityResult activityResult = new Instrumentation.ActivityResult(Activity.RESULT_OK, returnIntent);

    // Create an ActivityMonitor that catch ChildActivity and return mock ActivityResult:
    Instrumentation.ActivityMonitor activityMonitor = getInstrumentation().addMonitor(ChildActivity.class.getName(), activityResult , true);

    // Simulate a button click that start ChildActivity for result:
    final Button button = (Button) myActivity.findViewById(com.company.R.id.open_next_activity);
    myActivity.runOnUiThread(new Runnable() {
      @Override
      public void run() {
        // click button and open next activity.
        button.performClick();
      }
    });

    // Wait for the ActivityMonitor to be hit, Instrumentation will then return the mock ActivityResult:
    ChildActivity childActivity = getInstrumentation().waitForMonitorWithTimeout(activityMonitor, 5);

    // How do I check that StartActivityForResult correctly handles the returned result?
    assertTrue(myActivity.getActivityResultIsReturned());
    assertEqual(myActivity.getActiityResult(), "This is the result");
  }

  ... ...
}