spectre.console/test/Spectre.Console.Cli.Tests/Data/Settings/DogSettings.cs

namespace Spectre.Console.Tests.Data;

public sealed class DogSettings : MammalSettings
{
    [CommandArgument(0, "<AGE>")]
    public int Age { get; set; }

    [CommandOption("-g|--good-boy")]
    public bool GoodBoy { get; set; }

    public override ValidationResult Validate()
    {
        if (Name == "Tiger")
        {
            return ValidationResult.Error("Tiger is not a dog name!");
        }

        return ValidationResult.Success();
    }
}