[Concern("Funds transfer")]
public class when_transfering_an_amount_greater_than_the_balance_of_the_from_account : ContextSpecification
{
   private Account _fromAccount;
   private Account _toAccount;

   protected override void Context()
   {
      _fromAccount = new Account { Balance = 1m };
      _toAccount = new Account { Balance = 1m };
   }

   [Observation]
   public void should_not_allow_the_transfer()
   {
      typeof(Exception).ShouldBeThrownBy(delegate
      {
         _fromAccount.Transfer(2m, _toAccount);
      });
   }
}