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
@@ -72,3 +72,23 @@
   $ hg log -r '.' -T "{node}\n{date}\n"
   c2932ca7786be30b67154d541a8764fae5532261
   0.00
+
+Getting working copy diff
+
+  $ hg diff
+  diff -r c2932ca7786be30b67154d541a8764fae5532261 a
+  --- a/a	Thu Jan 01 00:00:00 1970 +0000
+  +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  @@ -1,1 +0,0 @@
+  -a
+  diff -r c2932ca7786be30b67154d541a8764fae5532261 c
+  --- a/c	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/c	Thu Jan 01 00:00:00 1970 +0000
+  @@ -1,1 +1,1 @@
+  -c
+  +c1
+  diff -r c2932ca7786be30b67154d541a8764fae5532261 d
+  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/d	Thu Jan 01 00:00:00 1970 +0000
+  @@ -0,0 +1,1 @@
+  +d