master 55540a3: * test/lisp/vc/vc-tests.el (vc-test--version-diff): Git env tweak.

[Glenn Morris]

branch: master
commit 55540a3d89862689340aa75d1370c3e8151ee934
Author: A <rgm@gnu.org>
Commit: Glenn Morris <rgm@gnu.org>

    * test/lisp/vc/vc-tests.el (vc-test--version-diff): Git env tweak.
---
 test/lisp/vc/vc-tests.el | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/lisp/vc/vc-tests.el b/test/lisp/vc/vc-tests.el
index 4169a96..aa401a2 100644
--- a/test/lisp/vc/vc-tests.el
+++ b/test/lisp/vc/vc-tests.el
@@ -616,9 +616,17 @@ This checks also `vc-backend' and 
`vc-responsible-backend'."
       (setq tempdir (make-temp-file "vc-test--version-diff" t)
             process-environment (cons (format "BZR_HOME=%s" tempdir)
                                       process-environment)))
+    ;; git tries various approaches to guess a user name and email,
+    ;; which can fail depending on how the system is configured.
+    ;; Eg if the user account has no GECOS, git commit can fail with
+    ;; status 128 "fatal: empty ident name".
     (when (memq backend '(Bzr Git))
       (setq process-environment (cons "EMAIL=john@doe.ee"
                                       process-environment)))
+    (if (eq backend 'Git)
+        (setq process-environment (append '("GIT_AUTHOR_NAME=A"
+                                            "GIT_COMMITTER_NAME=C")
+                                          process-environment)))
     (unwind-protect
         (progn
           ;; Cleanup.