vc-tests.el: vc-working-revision

vc-tests.el: vc-working-revision

[Michael Albinus]

Hi,

in vc-tests.el test cases vc-test-<backend>03-working-revision,
vc-working-revision is tested. This function returns different results
for different backends. See the comments in vc-test--working-revision:

;; Create empty repository.  Check working revision of repository.
;; nil: CVS Git Mtn RCS SCCS
;; "0": Bzr Hg SRC SVN

;; Check initial working revision.
;; nil: CVS Git Mtn RCS SCCS SVN
;; "0": Bzr Hg SRC

;; Write a new file.  Check working revision.
;; nil: CVS Git Mtn RCS SCCS SVN
;; "0": Bzr Hg SRC

;; Register a file.  Check working revision.
;; nil: Mtn Git RCS SCCS
;; "0": Bzr CVS Hg SRC SVN

;; Unregister the file.  Check working revision.
;; nil: Git RCS
;; "0": Bzr Hg
;; unsupported: CVS Mtn SCCS SRC SVN

I have no idea what the correct state shall be, it looks to me
strange. At least the unsupported state in the last test does not seem
to be right.

Furthermore, there is no documentation about in doc/emacs/maintaining.texi.

Best regards, Michael.