test: unquiet few tests to demonstrate changes in upcoming patches
Upcoming patches will skip revlog cloning for share-safe upgrades.
Differential Revision: https://phab.mercurial-scm.org/D9773
Set up
$ hg init repo
$ cd repo
Try to import an empty patch
$ hg import --no-commit - <<EOF
> EOF
applying patch from stdin
abort: stdin: no diffs found
[10]
No dirstate backups are left behind
$ ls .hg/dirstate* | sort
.hg/dirstate