Mocking Google Maps Library in a GWT app

We're developing a GWT app that makes heavy use of the Google Maps Library. That is, there is always (at lea开发者_开发百科st) one MapWidget attached to the DOM.

Is it somehow possible to mock out the Google Maps API? We're trying to

1. speed up the loading time of the application in development mode
2. use development mode in situations without an internet connection to prevent the error java.lang.RuntimeException: The Maps API has not been loaded

Two ways you can avoid the 'The Maps API has not been loaded' error:

1) Using a simple try / catch:

MapWidget map;

try {
      map = new MapWidget();
      doSomething();
}

2) Using the GWT AjaxLoader:

import com.google.gwt.ajaxloader.client.AjaxLoader;

AjaxLoader.loadApi("maps", "2", new Runnable() {
    public void run() {
        doSomething();
    }
}, null);