diff -r 000000000000 -r 6474c204b198 js/src/tests/supporting/test262-shell.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/supporting/test262-shell.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* 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/. */
+
+/*
+ * The current crop of Test262 test cases that we run are expected to pass
+ * unless they crash or throw.  (This isn't true for all Test262 test cases --
+ * for the ones marked @negative the logic is inverted.  We'll have to deal with
+ * that concern eventually, but for now we're punting so we can run subsets of
+ * Test262 tests.)
+ */
+testPassesUnlessItThrows();
+
+/*
+ * Test262 function $ERROR throws an error with the message provided. Test262
+ * test cases call it to indicate failure.
+ */
+function $ERROR(msg)
+{
+  throw new Error("Test262 error: " + msg);
+}
+
+/*
+ * Test262 function $INCLUDE loads a file with support functions for the tests.
+ * This function is replaced in browser.js.
+ */
+function $INCLUDE(file)
+{
+  load("supporting/" + file);
+}
+
+/*
+ * Test262 function fnGlobalObject returns the global object.
+ */
+var fnGlobalObject = (function()
+{
+  var global = Function("return this")();
+  return function fnGlobalObject() { return global; };
+})();