improve test coverage
improve test coverage


git-svn-id: b1a559638474b4fd03861be3ce73828307c8b77f@865 e071eeec-0327-468d-9b6a-08194a12b294

chronossc/django-ldapdb,UGentPortaal/django-ldapdb-archived,UGentPortaal/django-ldapdb