tests/crashgetbundler.py

stabletailgraph: add test cases challenging the open merge stack

This adds three more complex test cases with situations requiring tricky
state update in the stack-based iteration (arriving soon).

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)