Check special sync cases on feedback

Test 1 Web as a teacher: Configure a feedback to allow only one submission : Go to the activity setting and change "Allow multiple submissions" to No. The activity should not have any response. App as a student: Prefetch the activity and go offline. Web as a student: Complete the feedback. App as a student: Complete the feedback in offline. Go online and sync. App as a student: An error on app should be raised explaining the reason. Web as a teacher: Check the feedback from the app has not been recorded. Test 2 Web as a teacher: Configure a feedback to allow more than one submission : Go to the activity setting and change "Allow multiple submissions" to No. The activity should not have any response. Repeat steps 2-4 from test 1. App as a student: Check no error is raised Web as a teacher: Check the feedback from the app has been recorded. Test 3. Note: Give different answers from the app and from website and take note of them. App as a student: Prefetch a feedback with multiple pages and go offline. App as a student: Start answering a feedback, submit page 1 and navigate to page 2. Web as a student: Start answering a feedback submit pages 1 go to page 2. App as a student: Respond page 2, go online and finish the feedback. Web as a teacher: Check the feedback response has the answers from you entered on website on page 1 and the others from the app. (so page 1 from the app has been discarded).