Testing editing the 'force language' setting directly: Ensure the site has more than one language pack Run notifications to allow new 'moodle/course:setforcedlanguage' capability to be created Check the editing teacher + manager roles have the capability Login as a user with the capability Go to course settings page and force a language Remove the 'moodle/course:setforcedlanguage' capability from the editing teacher + manager roles Login as an editing teacher Check you can successfully edit the course settings but cannot force a language. Testing uploading a course: Not sure how to test a user without 'moodle/course:setforcedlanguage' using tool_uploadcourse, as only admins have access to tool_uploadcourse (AFAIK) and they automatically pass any has_capability checks ... Restoring a course: As a user with 'moodle/course:setforcedlanguage' Backup a course with 'force language' set Restore this course as a new course Check the new course has 'force language' set to the same value Restore the course over an existing course, allowing settings to be updated Check the updated course has 'force language' set to the same value As a user without 'moodle/course:setforcedlanguage' set Backup a course with 'force language' set Restore this course as a new course Check the new course does not have 'force language' set Restore the course over an existing course, allowing settings to be updated Check the updated course does not have 'force language' changed from the previous value Creating / updating a course via webservices: Set up a webservice user with capability 'moodle/course:setforcedlanguage' Call the 'create_courses' webservice, with 'lang' set Check that the course is created with 'force language' set to the value in the webservice call Call the 'update_courses' webservice, with 'lang' set to a different value to the current course 'force language' Check that the course has been updated so that 'force language' matches the 'lang' specified Update the webservice user to remove the capability 'moodle/course:setforcedlanguage' Call the 'create_courses' webservice, with 'lang' set Check that the course is created with 'force language' not set Call the 'update_courses' webservice, with 'lang' set set to a different value to the current course 'force language' Check that a 'require_capability' exception is thrown