1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-a-19.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-a-19.js
new file mode 100644
index 0000000000..5c83ccc2eb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-a-19.js
@@ -0,0 +1,31 @@
+// 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 -  decreasing length of array does not
+    delete non-configurable properties
+flags: [noStrict]
+---*/
+
+var arr = [0, 1, 2, 3];
+
+Object.defineProperty(arr, "2", {
+  get: function() {
+    return "unconfigurable";
+  },
+  configurable: false
+});
+
+Object.defineProperty(arr, "3", {
+  get: function() {
+    arr.length = 2;
+    return 1;
+  },
+  configurable: true
+});
+
+assert.sameValue(arr.lastIndexOf("unconfigurable"), 2, 'arr.lastIndexOf("unconfigurable")');
+
+reportCompare(0, 0);