Add roles.
Fix.
Add masquerading to handle_xblock_callback.
Add test.
Fix unit and integration tests.
Remove db call.
Move access check to get module.
Fix.
Fix acceptance test.
Fix course_id.
Remove blank lines in acceptance tests.
Fix grade url.
Determine LMS by get_real_user check. Change role var naming.
Fix test.
Add user role.
Handle roles in LTI module.
Fix tests.
Move user role check.
Fix func name.
Use assert_equal.