Test::TempDir provides temporary directory creation with testing in mind.
The differences between using this and using File::Temp are:
* If t/tmp is available (writable, creatable, etc) it's preferred
over $ENV{TMPDIR} etc. Otherwise a temporary directory will be
used.
This is temp_root
* Lockfiles are used on t/tmp, to prevent race conditions when
running under a parallel test harness.
* The temp_root is cleaned at the end of a test run, but not
if tests failed.
* temp_root is emptied at the begining of a test run unconditionally.
* The default policy is not to clean the individual tempfiles
and tempdirs within temp_root, in order to aid in debugging of
failed tests.
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