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This test requires Ghostscript and Poppler to be installed on the server.
You also need a large PDF file (the larger the better as you will then notice a greater time difference).
Direct access to your database is necessary to verify task_adhoc table records.

Log in as admin, go to Site administration > Server > System paths.
Verify that the Path to ghostscript setting points to your local gs path (be sure it is correctly set).
Verify that Path to pdftoppm setting is empty.
Open your database client, query the task_adhoc table:
select * from mdl_task_adhoc
Create a course and add an assignment with default options and Feedback types: Annotate PDF.
Log out then log in as a student, and submit the PDF file to the assignment.
Query the task_adhoc table again and verify a new record has been created for the student submission conversion.
Run the scheduled task:
php admin/cli/scheduled_task.php --execute='\assignfeedback_editpdf\task\convert_submissions'
This execution will use gs to generate PNG files from your PDF file. Record the total execution time.
Log out then log in as admin again and go to grade the submission.
Verify that you see the submission content.
Go to Site administration > Server > System paths and add your local pdftoppm path to the_Path to pdftoppm_ setting (be sure it is correctly set).
Repeat steps 6-10 using the same file (remove and add it again) and the same assignment.
Mention in a comment the pdftoppm time and the gs time.

is a QA test written for

MDL-70038 Implement Poppler pdftoppm compatibility for faster assignment submission PDF to PNG conversion