Instructor add a lesson page
Add student Content page, Click Edit
Select: Create grade book entries for these maximum points : 10
Select :Add a comments section to each page
grade these comments max point: 5
Click update items
Login as student st01, add student page
Login as student st02, add comment to st01
Login back to instructor
Click on 'Show Grading Pane for Comments on Student Content"
Enter a grade greater than max, e.g 8
Click 'update grade'
Grade is accepted with a green check displayed
Change to input a a negative grade
Click 'Update points'
The negative grade or grade more than max point defined should be invalid, and not be accepted