tests/crashgetbundler.py

transaction: tests we don't overwrite branch changes on abort

We actually do not! Great.

…Why are doing a backup of the `branch` files at transaction creation then‽

from mercurial.i18n import _
from mercurial import changegroup, error, extensions


def abort(orig, *args, **kwargs):
    raise error.Abort(_('this is an exercise'))


def uisetup(ui):
    extensions.wrapfunction(changegroup, 'getbundler', abort)