nsub-event-raising.cs

            var serviceBroker = Substitute.For<IServiceBroker>();
            var paymentRequest = Substitute.For<IPaymentRequest>();
            var scenarioSteps = new ScenarioSteps(serviceBroker,paymentRequest);

            var successfulSubmitPaymentArgs = new SubmitPaymentArgs(true);
            
            serviceBroker.When((sb)=>sb.SubmitPayment(paymentRequest)).Do((sb)=>serviceBroker.ServiceBrokerEventHandler+= Raise.EventWith(serviceBroker, (PaymentEventArgs)successfulSubmitPaymentArgs));
            
            var creditDebitPurchaseScenario = new CreditDebitPurchaseScenario(serviceBroker, scenarioSteps, null);
            creditDebitPurchaseScenario.MakePayment(paymentRequest);
            
            serviceBroker.Received().SubmitPayment(paymentRequest);
            serviceBroker.Received().ProcessTransaction(paymentRequest);