public void ManagerFactory_CreateSurveyManager_SurveyManagerCreated()
{
var client = Substitute.For <IMongoClient>();
_factory = new ManagerFactory(client, "linkDbName", "surveyDbName", "userDbName", "sessionDbName");
var manager = _factory.CreateSurveyManager();
Assert.NotNull(manager);
Assert.IsAssignableFrom <ISurveyManager>(manager);
Assert.IsType <SurveyManager>(manager);
}