Complete a current course with completion enabled. It doesn't matter which criteria is set. Wait until the course completion status  is changed to "completed" for the user (or run the cron script manually). You can check the status in the course completion block or in the "Completion" course tab in the app. Go to "Courses" tab in the site home and select the "Past" courses. Pull to refresh and check that the completed course is displayed in the grid.