branch: add tests which shows branch can be closed from a non-branchhead cset
This patch shows that we can close a branch even from a cset which is not
a branch head. It was supposed to abort this operation.
Next patch will be fixing the issue.
Differential Revision: https://phab.mercurial-scm.org/D6281
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state