These changes are covered by unit tests. But you can also manually test them as below. After applying the patch reopen the top page of the quiz statistics report. Click on the button that says 'Recalculate Now' Now : You will see that there are two rows in the 'Quiz structure analysis' table, one for the overall question statistics and one row for the single variant that has been seen by the student. Click on the hyperlinked question name, or the hyper linked question variant name. You will no longer see notices or a title 'Nothing to display'.