base.t, file.t: unlink temporary files created during testing

[jkeenan]

I run the Perl 5 core distribution's test suite dozens of times each week. If a test file within the core distribution's test suite creates a temporary file but fails to remove it before the test program completes, then I accumulate a large number of such tempfiles on my machine's /tmp.

The Digest distribution on CPAN ships with the core. Two of its test files create tempfiles but fail to remove them. Consequently, I accumulate a large number of files with identical content. Examples:

$ ls -ltr /tmp | tail -n 3
-rw-------  1 jkeenan  wheel         5 Aug 24 02:09 9Oq34QLwyH
-rw-------  1 jkeenan  wheel       301 Aug 24 02:09 lCcOQJNXNf
-rw-r--r--  1 root     wheel         0 Aug 24 02:14 zpool-io.tmp

$ head 9Oq34QLwyH lCcOQJNXNf 
==> 9Oq34QLwyH <==
foo

==> lCcOQJNXNf <==
abcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabc

$ find . -type f -size 301c 2>/dev/null | wc -l
     113
$ find . -type f -size 5c 2>/dev/null | wc -l
     106

This pull request unlinks the temporary files once they're no longer needed. Please review and issue a new CPAN release so that we can synch this into core.

Thank you very much.
Jim Keenan

[toddr]

looks great. thanks Jim!