Here's the patch to the testfile:

Index: src/jquery/coreTest.js
===================================================================
--- src/jquery/coreTest.js      (revision 1073)
+++ src/jquery/coreTest.js      (working copy)
@@ -82,8 +82,9 @@
 });
 
 test("attr(String, Function)", function() {
-       expect(1);
+       expect(2);
        ok( $('#text1').attr('value', function() { return this.id })[0].value == "text1", "Set value from id" );
+       ok( $('#text1').attr('title', function(i) { return i }).attr('title') == 1, "Set value with an index");
 });
 
 test("attr(Hash)", function() {

but alas i is undefined