diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_6/Array/find_findindex.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_6/Array/find_findindex.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,206 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 885553;
+var summary = 'Array.prototype.find and Array.prototype.findIndex';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function isString(v, index, array)
+{
+  assertEq(array[index], v);
+  return typeof v == 'string';
+}
+
+function dumpError(e)
+{
+  var s = e.name + ': ' + e.message +
+    ' File: ' + e.fileName +
+    ', Line: ' + e.lineNumber +
+    ', Stack: ' + e.stack;
+  return s;
+}
+
+var expect;
+var actual;
+var obj;
+
+var strings = ['hello', 'Array', 'WORLD'];
+var mixed   = [0, '1', 2];
+var sparsestrings = new Array();
+sparsestrings[2] = 'sparse';
+var arraylike = {0:0, 1:'string', 2:2, length:3};
+// array for which JSObject::isIndexed() holds.
+var indexedArray = [];
+Object.defineProperty(indexedArray, 42, { get: function() { return 42; } });
+Object.defineProperty(indexedArray, 142, { get: function() { return 'string'; } });
+
+// find and findIndex have 1 required argument
+
+expect = 1;
+actual = Array.prototype.find.length;
+reportCompare(expect, actual, 'Array.prototype.find.length == 1');
+actual = Array.prototype.findIndex.length;
+reportCompare(expect, actual, 'Array.prototype.findIndex.length == 1');
+
+// throw TypeError if no predicate specified
+expect = 'TypeError';
+try
+{
+  strings.find();
+  actual = 'no error';
+}
+catch(e)
+{
+  actual = e.name;
+}
+reportCompare(expect, actual, 'Array.find(undefined) throws TypeError');
+try
+{
+  strings.findIndex();
+  actual = 'no error';
+}
+catch(e)
+{
+  actual = e.name;
+}
+reportCompare(expect, actual, 'Array.findIndex(undefined) throws TypeError');
+
+// Length gets treated as integer, not uint32
+obj = { length: -4294967295, 0: 42 };
+expected = undefined;
+actual = Array.prototype.find.call(obj, () => true);
+reportCompare(expected, actual, 'find correctly treats "length" as an integer');
+expected = -1
+actual = Array.prototype.findIndex.call(obj, () => true);
+reportCompare(expected, actual, 'findIndex correctly treats "length" as an integer');
+
+// test find and findIndex results
+try
+{
+  expect = 'hello';
+  actual = strings.find(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'strings: find finds first string element');
+
+try
+{
+  expect = 0;
+  actual = strings.findIndex(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'strings: findIndex finds first string element');
+
+try
+{
+  expect = '1';
+  actual = mixed.find(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'mixed: find finds first string element');
+
+try
+{
+  expect = 1;
+  actual = mixed.findIndex(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'mixed: findIndex finds first string element');
+
+try
+{
+  expect = 'sparse';
+  actual = sparsestrings.find(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'sparsestrings: find finds first string element');
+
+try
+{
+  expect = 2;
+  actual = sparsestrings.findIndex(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'sparsestrings: findIndex finds first string element');
+
+try
+{
+  expect = 'string';
+  actual = [].find.call(arraylike, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'arraylike: find finds first string element');
+
+try
+{
+  expect = 1;
+  actual = [].findIndex.call(arraylike, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'arraylike: findIndex finds first string element');
+
+try
+{
+  expect = 1;
+  actual = 0;
+  Array.prototype.find.call({get 0(){ actual++ }, length: 1}, ()=>true);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'arraylike with getter: getter only called once');
+
+try
+{
+  expect = 'string';
+  actual = [].find.call(indexedArray, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'indexedArray: find finds first string element');
+
+try
+{
+  expect = 142;
+  actual = [].findIndex.call(indexedArray, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'indexedArray: findIndex finds first string element');