tests/failfilemerge.py

repoview: add more tests to track operation not supposed to trigger filtering

This test is useful to confirm we removed filtering trigger and to prevent
it to come back without us noticing.

The commands tested in the test were initially introduced one by one. However,
on Martin von Zweigbergk request, we are adding them all at once.

Differential Revision: https://phab.mercurial-scm.org/D7514

# extension to emulate interrupting filemerge._filemerge

from __future__ import absolute_import

from mercurial import (
    error,
    extensions,
    filemerge,
)


def failfilemerge(
    filemergefn, premerge, repo, wctx, mynode, orig, fcd, fco, fca, labels=None
):
    raise error.Abort("^C")
    return filemergefn(premerge, repo, mynode, orig, fcd, fco, fca, labels)


def extsetup(ui):
    extensions.wrapfunction(filemerge, '_filemerge', failfilemerge)