1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-10.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-10.js
new file mode 100644
index 0000000000..2915a82e7a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-10.js
@@ -0,0 +1,21 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    note that prior to the finally ES5 draft SameValue was used for comparisions
+    and hence NaNs could be found using lastIndexOf *
+esid: sec-array.prototype.lastindexof
+description: Array.prototype.lastIndexOf must return correct index (NaN)
+---*/
+
+var _NaN = NaN;
+var a = new Array("NaN", _NaN, NaN, undefined, 0, false, null, {
+  toString: function() {
+    return NaN
+  }
+}, "false");
+
+assert.sameValue(a.lastIndexOf(NaN), -1, 'NaN matches nothing, not even itself');
+
+reportCompare(0, 0);