1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-3-23.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-3-23.js
new file mode 100644
index 0000000000..af48742adb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-3-23.js
@@ -0,0 +1,40 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.lastindexof
+description: >
+    Array.prototype.lastIndexOf uses inherited valueOf method when
+    'length' is an object with an own toString and an inherited
+    valueOf methods
+---*/
+
+var toStringAccessed = false;
+var valueOfAccessed = false;
+
+var proto = {
+  valueOf: function() {
+    valueOfAccessed = true;
+    return 2;
+  }
+};
+
+var Con = function() {};
+Con.prototype = proto;
+
+var child = new Con();
+child.toString = function() {
+  toStringAccessed = true;
+  return 2;
+};
+
+var obj = {
+  1: child,
+  length: child
+};
+
+assert.sameValue(Array.prototype.lastIndexOf.call(obj, child), 1, 'Array.prototype.lastIndexOf.call(obj, child)');
+assert(valueOfAccessed, 'valueOfAccessed !== true');
+assert.sameValue(toStringAccessed, false, 'toStringAccessed');
+
+reportCompare(0, 0);