Remove visual noise from testtools

Change-Id: Idbf31a46a9e174b96b3cac76be6a01a6ada0abde
Reviewed-on: https://gerrit.libreoffice.org/8325
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>