tests/test-abort-checkin.t

largefiles: add tests for summary/outgoing improved in subsequent patches

This patch adds tests for summary/outgoing improved in subsequent
patches, to reduce amount of diffs in each patches.

This patch adds new revisions below:

  - revision #2 adds new largefiles, but they contain as same data as
    one already existing

    this causes that multiple standins refer the same data entity

  - revision #3, #4 and #5 change the already existing largefile

    this causes that multiple data entities are outgoing for the standin.
    #5 can be used to check de-duplication of "(hash, filename)" pair.

  $ cat > abortcommit.py <<EOF
  > from mercurial import util
  > def hook(**args):
  >     raise util.Abort("no commits allowed")
  > def reposetup(ui, repo):
  >     repo.ui.setconfig("hooks", "pretxncommit.nocommits", hook)
  > EOF
  $ abspath=`pwd`/abortcommit.py

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH
  $ echo "abortcommit = $abspath" >> $HGRCPATH

  $ hg init foo
  $ cd foo
  $ echo foo > foo
  $ hg add foo

mq may keep a reference to the repository so __del__ will not be
called and .hg/journal.dirstate will not be deleted:

  $ hg ci -m foo
  error: pretxncommit.nocommits hook failed: no commits allowed
  transaction abort!
  rollback completed
  abort: no commits allowed
  [255]
  $ hg ci -m foo
  error: pretxncommit.nocommits hook failed: no commits allowed
  transaction abort!
  rollback completed
  abort: no commits allowed
  [255]

  $ cd ..