Update unit.testng.xml in "rendering"

This is a small maintenance PR to get ``develop`` and ``dev_4_4`` inline. When #1601 got merged, I noticed I didn't update the file mentioned in this PR's title. This change is already in the rebased version of #1601.
--no-rebase
Merge pull request #1620 from bpindelski/patch-1

Update unit.testng.xml in "rendering"