The tests are run in dry-run mode to avoid having to restore the test
directories for each timed iteration. Using dry-run is an acceptable
compromise since we are mostly interested in the initial computation
of what to clean and not so much in the cleaning it self.
Signed-off-by: Erik Elfström <erik.elfstrom@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>