--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-diffdir.t	Tue Aug 17 17:57:48 2010 +0530
@@ -0,0 +1,40 @@
+  $ hg init
+  $ touch a
+  $ hg add a
+  $ hg ci -m "a" -d "1000000 0"
+
+  $ echo 123 > b
+  $ hg add b
+  $ hg diff --nodates
+  diff -r acd8075edac9 b
+  --- /dev/null
+  +++ b/b
+  @@ -0,0 +1,1 @@
+  +123
+
+  $ hg diff --nodates -r tip
+  diff -r acd8075edac9 b
+  --- /dev/null
+  +++ b/b
+  @@ -0,0 +1,1 @@
+  +123
+
+  $ echo foo > a
+  $ hg diff --nodates
+  diff -r acd8075edac9 a
+  --- a/a
+  +++ b/a
+  @@ -0,0 +1,1 @@
+  +foo
+  diff -r acd8075edac9 b
+  --- /dev/null
+  +++ b/b
+  @@ -0,0 +1,1 @@
+  +123
+
+  $ hg diff -r ""
+  abort: 00changelog.i@: ambiguous identifier!
+  $ hg diff -r tip -r ""
+  abort: 00changelog.i@: ambiguous identifier!
+
+  $ true