Testing with Robolectric what the intent is when clicking a notification in android

1_test.java

@Test
public void clickingOnTheTextOpensANotificationWhichOpensTheResultActivity() {
  DeckardActivity activity = Robolectric.setupActivity(DeckardActivity.class);
  View text = activity.findViewById(R.id.text);
  text.performClick();

  NotificationManager notificationService = (NotificationManager) activity.getSystemService(Context.NOTIFICATION_SERVICE);
  ShadowNotificationManager shadowNotificationManager = shadowOf(notificationService);
  assertThat(shadowNotificationManager.size(), equalTo(1));

  Notification notification = shadowNotificationManager.getAllNotifications().get(0);

  //This next line surprised me! I was gonna try notification.getLatestEventInfo().getContentIntent();
  PendingIntent contentIntent = notification.contentIntent;

  Intent nextIntent = shadowOf(contentIntent).getSavedIntent();
  
  //Now we have the intent and can check things about it as usual, e.g. next class name, extras
  String nextClassName = nextIntent.getComponent().getClassName();
  assertThat(nextClassName, equalTo(ResultActivity.class.getName()));
}

2_activity.java

//Somewhere in the activity, when a notification is triggered...

NotificationCompat.Builder builder =
new NotificationCompat.Builder(this)
  .setSmallIcon(android.R.drawable.btn_star)
  .setContentTitle("My notification")
  .setContentText("Hello World!");

Intent resultIntent = new Intent(this, ResultActivity.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
stackBuilder.addParentStack(ResultActivity.class);
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(resultPendingIntent);

NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, builder.build());