I have identified a relatively few instances in the tests I have written where I used tempfile() without UNLINK =>1 or tempdir() without CLEANUP => 1. I have fixed those situations. I have then done make realclean, perl Configure.pl --test and checked to see whether any files were created under /tmp during the past 5 minutes. None were created.
There may, of course, be files run during make test that I didn't write that have these problems. But I think I've caught my cases. kid51