Boostrapping.cs

public void RegisterServices()
{
	// while running the service locally, mock external call
	// so it always succeeds (as long as it 
	// itself is not the subject of the test)
	var isDevelopmentEnvironment = DetermineCurrentEnvironment();
	
	if (isDevelopmentEnvironment)
		webserviceContainer.Register<ICancelPurchaseOrderLine,
			AlwaysCancelPurchaseOrderLineSuccessfully>();                
	else // otherwise use the actual live web service adapter
		webserviceContainer.Register<ICancelPurchaseOrderLine,
			RealPurchaseOrderService>();
}