activity = new ActivityImpl("activityId", johnDoe.getId());
activity.setMediaItems(Lists.<MediaItem> newArrayList(new MediaItemImpl("image/jpg",
MediaItem.Type.IMAGE, "http://foo.bar")));
Injector injector = Guice.createInjector(new JsonLibTestsGuiceModule());
beanJsonLibConverter = injector.getInstance(BeanJsonLibConverter.class);
beanJsonConverter = new BeanJsonConverter(
Guice.createInjector(new SocialApiTestsGuiceModule()));