Shorten the tools module name; use TestUtil.AssertEqual where applicable;
remove unnecessary variables that only made noise and masked what was
actually asserted; add missing licence headers.
Change-Id: If891ed8ceb38fed18335aad061b2b09d341264f7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108118
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>