> At some level, I'm not sure it really matters as long as the test uses
> whatever actual filesystem ownership is in place checking for default
> values.

I think that's difficult to implement, as the files are not there
anymore when the check is made (only the tarfile); somebody correct
me if I'm wrong. So I agree that the test for group ownership should
be dropped, in the failing case (i.e. where nothing was specified for
the tar command).