1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-9.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-9.js
new file mode 100644
index 0000000000..142287e556
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-9.js
@@ -0,0 +1,27 @@
+// 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 must return correct index (Sparse
+    Array)
+---*/
+
+var a = new Array(0, 1);
+a[4294967294] = 2; // 2^32-2 - is max array element index
+a[4294967295] = 3; // 2^32-1 added as non-array element property
+a[4294967296] = 4; // 2^32   added as non-array element property
+a[4294967297] = 5; // 2^32+1 added as non-array element property
+// stop searching near the end in case implementation actually tries to test all missing elements!!
+a[4294967200] = 3;
+a[4294967201] = 4;
+a[4294967202] = 5;
+
+
+assert.sameValue(a.lastIndexOf(2), 4294967294, 'a.lastIndexOf(2)');
+assert.sameValue(a.lastIndexOf(3), 4294967200, 'a.lastIndexOf(3)');
+assert.sameValue(a.lastIndexOf(4), 4294967201, 'a.lastIndexOf(4)');
+assert.sameValue(a.lastIndexOf(5), 4294967202, 'a.lastIndexOf(5)');
+
+reportCompare(0, 0);