code: public static void assertRequestReceived(String msg, String method, MessageListener obj) {
      assertNotNull("Null assert object passed in", obj);
      assertTrue(msg, requestReceived(method, obj));
    }
docs: Asserts that the given message listener object received a request with the indicated request
  method. Assertion failure output includes the given message text.
  
  @param msg message text to output if the assertion fails.
  @param method The request method to check for (eg, SipRequest.INVITE)
  @param obj The MessageListener object (ie, SipCall, Subscription, etc.).