1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-9.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-9.js
new file mode 100644
index 0000000000..8f45c25286
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-9.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 a number of value 0.1
+---*/
+
+var targetObj = [];
+var obj = {
+  0: targetObj,
+  100: targetObj,
+  length: 0.1
+};
+
+assert.sameValue(Array.prototype.lastIndexOf.call(obj, targetObj), -1, 'Array.prototype.lastIndexOf.call(obj, targetObj)');
+
+reportCompare(0, 0);