--- a/tests/test-uncommit.t	Tue Jul 11 11:12:23 2017 +0200
+++ b/tests/test-uncommit.t	Tue Jul 11 11:58:07 2017 +0200
@@ -362,3 +362,25 @@
   $ hg cat b --rev .
   b
   b
+
+Test message update
+
+  $ hg log -r .
+  changeset:   12:912ed871207c
+  branch:      bar
+  tag:         tip
+  parent:      7:4f1c269eab68
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     touncommit
+  
+  $ hg uncommit -m 'to-uncommit' d
+  $ hg log -r .
+  changeset:   13:dfe358c8c130
+  branch:      bar
+  tag:         tip
+  parent:      7:4f1c269eab68
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     to-uncommit
+