mercurial/utils/hashutil.py

tests: add test showing that merge state is not cleared by amend

This is slightly modified version of the test case I provided in
issue6304.

Differential Revision: https://phab.mercurial-scm.org/D8931

from __future__ import absolute_import

import hashlib

try:
    from ..thirdparty import sha1dc

    sha1 = sha1dc.sha1
except (ImportError, AttributeError):
    sha1 = hashlib.sha1