--- a/tests/test-evolve-effectflags.t	Fri May 19 19:43:06 2017 +0200
+++ b/tests/test-evolve-effectflags.t	Fri May 19 19:48:44 2017 +0200
@@ -35,3 +35,20 @@
   x  471f378eab4c (1) A0
        rewritten by test (*) as fdf9bde5129a (glob)
   
+
+amend touching the metadata only
+--------------------------------
+
+  $ mkcommit B0
+  $ hg amend -u "bob <bob@bob.com>"
+
+check result
+
+  $ hg debugobsolete --rev .
+  ef4a313b1e0ade55718395d80e6b88c5ccd875eb 5485c92d34330dac9d7a63dc07e1e3373835b964 0 (*) {'ef1': '2', 'user': 'test'} (glob)
+  $ hg obslog .
+  @  5485c92d3433 (4) B0
+  |
+  x  ef4a313b1e0a (3) B0
+       rewritten by test (*) as 5485c92d3433 (glob)
+