1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-7.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-7.js
new file mode 100644
index 0000000000..427740b352
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-7.js
@@ -0,0 +1,39 @@
+// 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 returns -1 if 'length' is 0 ( length
+    is object overridden with obj w/o valueOf (toString))
+---*/
+
+foo.prototype = new Array(1, 2, 3);
+
+function foo() {}
+var f = new foo();
+
+var o = {
+  toString: function() {
+    return '0';
+  }
+};
+f.length = o;
+
+// objects inherit the default valueOf method of the Object object;
+// that simply returns the itself. Since the default valueOf() method
+// does not return a primitive value, ES next tries to convert the object
+// to a number by calling its toString() method and converting the
+// resulting string to a number.
+var i = Array.prototype.lastIndexOf.call({
+  length: {
+    toString: function() {
+      return '0';
+    }
+  }
+}, 1);
+
+
+assert.sameValue(i, -1, 'i');
+
+reportCompare(0, 0);