[ticket/11744] Inheritdoc

PHPBB3-11744
[ticket/11744] Cast to int

PHPBB3-11744
Merge branch 'ticket/11744' of github.com:EXreaction/phpbb3 into ticket/11744

* 'ticket/11744' of github.com:EXreaction/phpbb3:
  [ticket/11744] Helper function to assert notifications in base test