--- a/tests/test-log.t	Thu Jun 16 01:57:59 2011 +0200
+++ b/tests/test-log.t	Thu Jun 16 01:58:00 2011 +0200
@@ -1138,3 +1138,21 @@
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     a
   
+  $ cat > $HGTMP/testhidden.py << EOF
+  > def reposetup(ui, repo):
+  >     for line in repo.opener('hidden'):
+  >         ctx = repo[line.strip()]
+  >         repo.changelog.hiddenrevs.add(ctx.rev())
+  > EOF
+  $ echo '[extensions]' >> $HGRCPATH
+  $ echo "hidden=$HGTMP/testhidden.py" >> $HGRCPATH
+  $ touch .hg/hidden
+  $ hg log --template='{rev}:{node}\n'
+  1:a765632148dc55d38c35c4f247c618701886cb2f
+  0:9f758d63dcde62d547ebfb08e1e7ee96535f2b05
+  $ echo a765632148dc55d38c35c4f247c618701886cb2f > .hg/hidden
+  $ hg log --template='{rev}:{node}\n'
+  0:9f758d63dcde62d547ebfb08e1e7ee96535f2b05
+  $ hg log --template='{rev}:{node}\n' --hidden
+  1:a765632148dc55d38c35c4f247c618701886cb2f
+  0:9f758d63dcde62d547ebfb08e1e7ee96535f2b05