--- a/tests/test-tag	Sun Jul 25 20:01:33 2010 -0500
+++ b/tests/test-tag	Tue Jul 27 14:40:25 2010 -0400
@@ -7,6 +7,9 @@
 hg add a
 hg commit -m "test" -d "1000000 0"
 hg history
+
+hg tag ' '
+
 hg tag -d "1000000 0" "bleah"
 hg history