--- a/tests/test-uncommit.t	Thu Aug 14 15:26:55 2014 -0700
+++ b/tests/test-uncommit.t	Fri Aug 15 00:46:23 2014 -0700
@@ -336,3 +336,25 @@
   [8] touncommit
   $ hg uncommit aa
   1 new unstable changesets
+
+Test uncommiting agains a different base
+
+  $ hg cat b --rev .
+  b
+  b
+  $ hg cat b --rev .^
+  b
+  $ hg cat b --rev 0
+  b: no such file in rev 07f494440405
+  [1]
+  $ hg uncommit --rev 0 b
+  $ hg cat b --rev .
+  b: no such file in rev 5b27f6b17da2
+  [1]
+
+Test uncommiting precursors
+
+  $ hg uncommit --hidden --rev 'precursors(.)' b
+  $ hg cat b --rev .
+  b
+  b