using System;

using Moq;

using System.Threading.Tasks;

​

public class Program

{   

    private Mock<IContrato> example;

    public Program()    

    {       

        example = new Mock<IContrato>();                

        example.SetupSequence(m => m.Executar())            

            .ReturnsAsync("Primeiro retorno")           

            .ReturnsAsync("Segundo retorno")            

            .ReturnsAsync("Terceiro retorno");  

    }       

    public async Task<string> GetMockedExecution()  

    {       

        return await example.Object.Executar(); 

    }       

    public static async Task Main() 

    {       

        var program = new Program();        

        for(int i = 0; i < 3; i++)

        {

            Console.WriteLine(await program.GetMockedExecution());

        }

    }

}

​

public interface IContrato

{   

    Task<string> Executar();    

}

​

public class POC : IContrato

{   

    public string estado = "Valor default";

    public Task<string> Executar()  

    {       

        return Task.FromResult<string>(estado); 

    }

}

​