diff -r 000000000000 -r 6474c204b198 js/xpconnect/tests/unit/test_blob.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/xpconnect/tests/unit/test_blob.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+/* 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/. */
+ 
+function run_test() {   
+  do_load_manifest("component-blob.manifest");
+  const contractID = "@mozilla.org/tests/component-blob;1";
+  do_check_true(contractID in Components.classes);
+  var foo = Components.classes[contractID]
+                      .createInstance(Components.interfaces.nsIClassInfo);
+  do_check_true(Boolean(foo));
+  do_check_true(foo.contractID == contractID);
+  do_check_true(!!foo.wrappedJSObject);
+  do_check_true(foo.wrappedJSObject.doTest());
+
+}