D2597: graft: add test for reading old format state files with new mechanism

[durin42 (Augie Fackler)]

durin42 added a comment.


  Overall I think I like where this is headed.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2597

To: pulkit, #hg-reviewers
Cc: durin42, mercurial-devel