instance is has been used instead of cmid. This works as all id's are 1
in most cases, but not always.
accesslib_clear_all_caches_for_unit_testing was updated to clear the
$USER->access cache which would fail test when the wrong user's data was used.
Conflicts from extra tests in master:
blocks/comments/tests/events_test.php
mod/assign/submission/comments/tests/events_test.php
mod/data/tests/lib_test.php
mod/glossary/tests/events_test.php
Russell Smith