diff --git a/tests/test-repo-filters-tiptoe.t b/tests/test-repo-filters-tiptoe.t
--- a/tests/test-repo-filters-tiptoe.t
+++ b/tests/test-repo-filters-tiptoe.t
@@ -66,3 +66,10 @@
   A d
   R a
   ! b
+
+Getting data about the working copy parent
+
+  $ hg log -r '.' -T "{node}\n{date}\n"
+  debug.filters: computing revision filter for "visible"
+  c2932ca7786be30b67154d541a8764fae5532261
+  0.00