Setup Install and enable the dummy fileconverter: git clone git@github.com:catalyst/moodle-fileconverter_dummy.git files/converter/dummy Browse to "Site administration" > "Plugins" > "Document converters" > "Manage document converters" and enable the dummy converter by "opening the eye" - ensure other converters are disabled Create a course and add an assignment with only the "Online text" submission type enabled Normal flow Enrol a student in the course As the student, make a submission for the assignment (make a note of what you type for the online text submission) From the CLI run: php admin/cli/adhoc_task.php -e Verify you see the following in the output: Dummy conversion started. Conversion still in progress. Requeueing self to check again. Check the mdl_task_adhoc table and verify there is a row containing "\assignfeedback_editpdf\task\convert_submission" in the classname column Wait 60 seconds Run php admin/cli/adhoc_task.php -e again Verify you see the following in the output: Dummy conversion completed. As the admin, browse the the assignment and press "View all submissions" Press "Grade" for the student who submitted Verify the same text entered for the submission is visible in the grader (there will be some additional HTML around it, that's fine) Error flow Hack the function get_combined_pdf_for_attempt in mod/assign/feedback/editpdf/classes/document_services.php so that it throws an exception immediately, like so: mod/assign/feedback/editpdf/classes/document_services.php 335 public static function get_combined_pdf_for_attempt( $assignment , $userid , $attemptnumber ) { 336 throw new \moodle_exception( 'exceptiontest' ); 337 $document = self::get_combined_document_for_attempt( $assignment , $userid , $attemptnumber ); Enrol a student in the course As the student, make a submission for the assignment (make a note of what you type for Check the mdl_task_adhoc table and take note of the ID of the "\assignfeedback_editpdf\task\convert_submission" task From the CLI run: php admin/cli/adhoc_task.php -e Verify an exception is thrown with the message: "Adhoc task failed: assignfeedback_editpdf\task\convert_submission,error/exceptiontest" Check the mdl_task_adhoc table and verify the row from earlier is still there, and now has a value of 60 in the "faildelay" column Revert the change to document_services.php (remove the exception throw) Wait 60 seconds Run: php admin/cli/adhoc_task.php -e Verify you see the following in the output: Dummy conversion started. Conversion still in progress. Requeueing self to check again. Check the mdl_task_adhoc table and verify a new task was added, take note of its ID Hack document_services.php again, adding the exception as before Run: php admin/cli/adhoc_task.php -e Verify the exception is thrown again, and the faildelay was added to the row in the mdl_task_adhoc table Revert the change to document_services.php and wait 60 seconds Run: php admin/cli/adhoc_task.php -e Verify you see the following in the output: Dummy conversion completed. As the admin, browse the the assignment and press "View all submissions" Press "Grade" for the student who submitted Verify the same text entered for the submission is visible in the grader (there will be some additional HTML around it, that's fine)