diff -r 000000000000 -r 6474c204b198 testing/xpcshell/example/unit/test_check_nsIException.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/xpcshell/example/unit/test_check_nsIException.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function run_test() {
+  let env = Components.classes["@mozilla.org/process/environment;1"]
+                      .getService(Components.interfaces.nsIEnvironment);
+  do_check_throws_nsIException(function () {
+    env.QueryInterface(Components.interfaces.nsIFile);
+  }, "NS_NOINTERFACE");
+}
+