--- a/tests/test-rewind.t	Sun Jun 17 03:46:46 2018 +0200
+++ b/tests/test-rewind.t	Sun Jun 17 03:56:54 2018 +0200
@@ -917,3 +917,21 @@
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     c_ROOT
   
+  $ cd ..
+
+Check error cases
+=================
+
+  $ hg clone rewind-testing-base rewind-testing-error
+  updating to branch default
+  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cd rewind-testing-error
+
+Uncommited changes
+------------------
+
+  $ echo C > C
+  $ hg add C
+  $ hg rewind
+  abort: uncommitted changes
+  [255]