--- a/tests/test-commit-amend.t Fri Dec 21 22:58:59 2012 +0100
+++ b/tests/test-commit-amend.t Mon Dec 31 17:44:18 2012 -0600
@@ -458,3 +458,23 @@
$ hg commit --amend
$ hg id
b99e5df575f7 (a) tip
+
+Test ui.prevent-unstable
+---------------------------------------------------------------------
+
+ $ hg up '.^'
+ 0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+ $ echo 'b' >> a
+ $ hg log --style compact -r 'children(.)'
+ 18[tip]:11 b99e5df575f7 1970-01-01 00:00 +0000 test
+ babar
+
+ $ hg commit --amend
+ $ hg log -r 'unstable()'
+ changeset: 18:b99e5df575f7
+ branch: a
+ parent: 11:3334b7925910
+ user: test
+ date: Thu Jan 01 00:00:00 1970 +0000
+ summary: babar
+