using System;

public class Program

{

    public sealed class ActorId

    {

        public ActorId(int val) => Value = val;

        public int Value;

    }

    public interface IActorId 

    {

        int Value { get; }

    }

    public class CoyoteActorId : IActorId

    {

        private ActorId _actorId;

        public CoyoteActorId(ActorId id)

            => _actorId = id;

        public int Value => _actorId.Value;

    }

    public class TestActorId : IActorId

    {

        private int _value;

        private int GenerateUniqueId() => 0; // would generate an uid

        public TestActorId()

        {

            _value = GenerateUniqueId();    

        }

        public int Value => _value; 

    }

    public interface IActorCreator

    {

        IActorId CreateMachine();

    }

    public static class CoyoteFrameworkBits

    {

        public static ActorId CreateMachine() => new ActorId(0);

    }

    public class CoyoteActorCreator : IActorCreator

    {

        public IActorId CreateMachine()

        {

            ActorId id = CoyoteFrameworkBits.CreateMachine();

            return new CoyoteActorId(id);

        }

    }

    public class TestActorCreator : IActorCreator

    {

        public IActorId CreateMachine() => new TestActorId();

    }

    public static void Main()

    {

        // in test

        IActorCreator myActorCreator = new TestActorCreator();

        IActorId id = myActorCreator.CreateMachine();

        // in prod

        myActorCreator = new CoyoteActorCreator();

        id = myActorCreator.CreateMachine();

    }

}