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Unit Testing a Android Activity which contains a Runnable

November 16, 2010 by Annyce Davis Leave a Comment

In order to unit test an Android Activity to verify that the Runnable is called you need to add a call to waitForIdle to the Instrumentation, which is called when all Runnables have been executed.

Here is the activity that we are testing:

public class SplashScreenActivity extends Activity {

public final int SPLASH_DISPLAY_LENGTH = 1200;

@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.splash);

new Handler().postDelayed(new Runnable() {

public void run() {
Intent mainIntent = new Intent(SplashScreenActivity.this, NextActivity.class);
startActivity(mainIntent);
finish();
}

}, SPLASH_DISPLAY_LENGTH);
}
}

Here is the method in the Unit Test Class:

public void testSubLaunch() {
SplashScreenActivity mActivity = startActivity(new Intent(), null, null);
getInstrumentation().waitForIdle(new Runnable() {
public void run() {
assertNotNull(getStartedActivityIntent());
assertTrue(isFinishCalled());
}
});
}

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Filed Under: Android Tagged With: Runnable, Unit Testing

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