Context

gistfile1.txt

public class AccountSpecifications
{
    const decimal perTransactionFee = 0.99m;
    
    public Specification when_withdrawing_money()
    {
        var currentBalance = 13.0m;
        
        return new ActionSpecification<AccountContext>
        {
           On = () => new AccountContext {
                        Account = new Account(currentBalance),
                        Command = new WithdrawCommand
                                      {
                                          Amount = 12.00m
                                      }
                      },
           When = account => account.Handle(cmd),
           Expect =
           {
               account => account.Balance == (currentBalance - cmd.Amount) - perTransactionFee,
               account => account.CloseToZeroBalance
           },
        };
    }

    public class AccountContext {
      public Command Command;
      public Account Account;
    }
}

ok, I'll have a look. Tnx!