NEW Assignment Test 2.3 - A teacher can enable submission comments when file submissions is enabled

Test Pre-Requisites:
An assignment exists with file submissions enabled and 'Allow submission comments' set to Yes.
This test must be tested with the new 2.3 Assignment plugin ONLY.

1. Login as a student and access the assignment.
2. Add a submission comment and save the comment.
3. Delete the submission comment, and enter a new comment, and save your changes.
4. Check that the changes have been saved.