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;
    }
}

If you want strong typing just make your own template (like what ActionSpecification does).

For runners I know all about fields :) I built all that support into mighty moose for simple.testing and for machine.specs

btw for a reference see:

https://github.com/gregoryyoung/Simple.Testing/blob/master/src/Simple.Testing.ClientFramework/SpecificationTemplates.cs

At the end of the day its just doing Expect(When(Given())) you can change what the pipeline types are along the way (the templates just give strong typing to it as a template)

ok, I'll have a look. Tnx!