--- a/tests/test-graft.t	Thu Jan 10 21:32:37 2019 +0900
+++ b/tests/test-graft.t	Thu Jan 10 21:57:21 2019 +0900
@@ -112,6 +112,16 @@
   skipping ancestor revision 1:5d205f8b35b6
   [255]
 
+Conflicting date/user options:
+
+  $ hg up -q 0
+  $ hg graft -U --user foo 2
+  abort: --user and --currentuser are mutually exclusive
+  [255]
+  $ hg graft -D --date '0 0' 2
+  abort: --date and --currentdate are mutually exclusive
+  [255]
+
 Can't graft with dirty wd:
 
   $ hg up -q 0