Testing is easier if you use two browsers: one logged in as a teacher, one logged in as a student. Note: You'll need to be able to capture and monitor outbound emails - so please use something like mailcatcher and make sure to set up Moodle's SMTP server to point to this. [Teacher] Create an assignment with the 'Hide Grader' option off (it should be off by default). [Student] Add a submission to the assignment [Teacher] Grade the submission, and make sure 'Notify student' is enabled. Run cron: php admin/cli/cron.php [Student] The student will receive an email, with the grader's name visible. [Student] Visit the 'View Submission' page. Verify the grader's name is visible on the page. [Teacher] Enable the 'Hide Grader' option in the assignment's settings. [Student] Visit the 'View Submission' page. Verify the grader's name is not shown on the page. [Teacher] Re-grade the assignment, and make sure 'Notify student' is enabled. Run cron: php admin/cli/cron.php [Student] The student will receive an email, and the grader's name will not be visible. [Teacher] Edit the assignment's permissions, and give the 'Show Hidden Grader' permission to the Student role. [Student] Visit the 'View Submission' page. Verify the grader's name is now visible. [Teacher] Re-grade the assignment, and make sure 'Notify student' is enabled. Run cron: php admin/cli/cron.php [Student] The student will receive an email, with the grader's name visible.