public void Given_a_bank_account_when_notified_of_an_event_it_does_not_expect_nor_support_then_expect_a_throw()
{
var model = new BankAccount();
var handler = new ConventionEventHandler(model);
Assert.Throws<InvalidOperationException>(() => handler.OnNext(new InvalidEventArgs()));
}
public void Given_a_clean_bank_account_when_credited_with_100_then_balance_is_100()
{
var model = new BankAccount();
var handler = new ConventionEventHandler(model);
handler.OnNext(new Credited(100));
Assert.That(model.Balance == 100);
}