1 files changed, 16 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-5-4.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-5-4.js
new file mode 100644
index 0000000000..6ae526981b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-5-4.js
@@ -0,0 +1,16 @@
+// 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 when fromIndex is undefined
+---*/
+
+var a = new Array(1, 2, 1);
+
+// undefined resolves to 0, no second argument resolves to len
+assert.sameValue(a.lastIndexOf(2, undefined), -1, 'a.lastIndexOf(2,undefined)');
+assert.sameValue(a.lastIndexOf(1, undefined), 0, 'a.lastIndexOf(1,undefined)');
+assert.sameValue(a.lastIndexOf(1), 2, 'a.lastIndexOf(1)');
+
+reportCompare(0, 0);