gistfile1.cs

/*
  Write a test or tests to validate that the correct FubarData is passed to IFubarDataService.Validate(...)
  from the Fubar that is passed to ValidateFubar.

  e.g. did the Fubar.Name match the FubarData.Name 

  -- note: imagine there was 15+ properties on both Fubar and FubarData that needed validating
*/



public class FubarValidator {
 
  IFubarDataService _dataService;

  public FubarValidator(IFubarDataService dataService) {
       _dataService = dataService;
  }

  public bool ValidateFubar(Fubar fubar) {
    
    FubarData data = new FubarData();

    data.Name = fubar.Name;
    data.LocationId = fubar.LocationId;
    data.ComputerAvailable = fubar.HasComputer ? "yes" : "no";
    data.FavoritePizza = fubar.FavoritePizza;   

    return _dataService.Validate(data);
  }

}


//interfaces

public interface IFubarDataService {
   bool Validate(FubarData data);
}


//pocos


public class Fubar {

  public string Name { get; set; }

  public int LocationId { get; set; }

  public string FavoritePizza { get; set; }

  public bool HasComputer { get; set; }

}

public class FubarData {

  public string Name { get; set; }

  public int LocationId { get; set; }

  public string FavoritePizza { get; set; }

  public bool ComputerAvailable { get; set; }
}