1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-2-2.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-2-2.js
new file mode 100644
index 0000000000..53f995706d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-2-2.js
@@ -0,0 +1,18 @@
+// 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 - 'length' is own data property on an
+    Array
+---*/
+
+var targetObj = {};
+
+Array.prototype[2] = targetObj;
+
+assert.sameValue([0, targetObj].lastIndexOf(targetObj), 1, '[0, targetObj].lastIndexOf(targetObj)');
+assert.sameValue([0, 1].lastIndexOf(targetObj), -1, '[0, 1].lastIndexOf(targetObj)');
+
+reportCompare(0, 0);