commit 2a1c636156dd0abb61f4da117dd42b6283e877ec
Author: Mark Glines <mark@glines.org>
Date:   Sun Jun 14 18:41:47 2009 -0400

    Test is_deeply()'s Undef vs. !exists handling.

diff --git a/t/library/test_more.t b/t/library/test_more.t
index 396b0b7..ee006ec 100644
--- a/t/library/test_more.t
+++ b/t/library/test_more.t
@@ -22,7 +22,7 @@
     exports = split " ", "plan test_out test_diag test_fail test_pass test_test"
     test_namespace.'export_to'(curr_namespace, exports)
 
-    plan( 75 )
+    plan( 76 )
 
     test_skip()
     test_todo()
@@ -326,9 +326,13 @@
 .sub test_is_deeply_hash
     .local pmc left
     .local pmc right
+    .local pmc undef1
+    .local pmc undef2
 
-    left  = new 'Hash'
-    right = new 'Hash'
+    left   = new 'Hash'
+    right  = new 'Hash'
+    undef1 = new 'Undef'
+    undef2 = new 'Undef'
 
     test_pass()
     is_deeply( left, right )
@@ -369,6 +373,13 @@
     test_pass()
     is_deeply( left, right )
     test_test( 'passing test is_deeply() for hashes created in different orders' )
+
+    right['undef1'] = undef1
+    left['undef2']  = undef2
+    test_fail()
+    is_deeply( left, right )
+    test_diag( 'Mismatch at [undef2]: expected Undef, received nonexistent' )
+    test_test( 'failing is_deeply() for undef in left, nonexistent in right' )
 .end
 
 .sub test_is_deeply_mismatch