The Tor Browser / file revision

 function run_test() {

   var stream = Cc["@mozilla.org/io/string-input-stream;1"].

     createInstance(Ci.nsISupportsCString);

   stream.data = "foo bar baz";

   var pump = Cc["@mozilla.org/network/input-stream-pump;1"].

     createInstance(Ci.nsIInputStreamPump);

   pump.init(stream, -1, -1, 0, 0, false);

   // When we pass a null listener argument too asyncRead we expect it to throw

   // instead of crashing.

   try {

     pump.asyncRead(null, null);

   }

   catch (e) {

     return;

   }

   do_throw("asyncRead didn't throw when passed a null listener argument.");

 }