Add some quizzes to a course. Try to use different settings: quiz not opened, quiz closed, quiz without questions, quiz with questions not supported by the app, limited attempts, timing, etc. Check that you can see the quiz data in its entry page: open/close time, attempts allowed, grading method, best grade, etc. Check that an error message is shown if the quiz can't be played. Check that the button message is the right one depending on the current state. Check that you can see a list of the previous attempts. Check that you can see the details of an attempt by clicking the button in the right side.