code: public void respond(final ExpectationResponseCallback expectationResponseCallback) {
          expectation.thenRespond(new HttpObjectCallback().withClientId(registerWebSocketClient(expectationResponseCallback)));
          mockServerClient.sendExpectation(expectation);
      }
docs: Call method on object locally or remotely (over web socket)
  to generate response to return when expectation is matched
  
  @param expectationResponseCallback object to call locally or remotely to generate response