public void Process(Credited @event)
        {
            var accountOverview = _entityContext.Entities.Where(a => a.AccountNumber == @event.AccountNumber).Single();

            accountOverview.Balance -= @event.Amount;
            _entityContext.Save(accountOverview);

            _accountBalanceChanged(accountOverview.AccountNumber, accountOverview.Balance);
        }
        public void Given_a_bank_account_when_credited_with_100_via_direct_handle_method_invocation_then_expect_100_as_a_balance()
        {
            var ba = new BankAccount();
            var e = new Credited(100);

            Action<object, EventArgs> method;
            if (new HandleMethodFastInvocation(typeof(BankAccount)).TryGetMethod(e, out method))
                method(ba, e);

            Assert.AreEqual(100, ba.Balance);
        }