AutoFixture + NSubstitute Demo

AutoNSubstituteDemo.cs

using NSubstitute;
using Ploeh.AutoFixture;
using Ploeh.AutoFixture.AutoNSubstitute;
using Ploeh.AutoFixture.Xunit;
using Xunit.Extensions;

namespace AutofixtureDemo
{
    public class AutoNSubstituteDemo
    {
        [Theory, AutoNSubstituteData]
        public void should_validate_password_and_record(
            User user, 
            [Frozen] IValidator validator,
            [Frozen] IAuditLogger auditLogger, 
            Controller controller)
        {
            // arrange
            validator.IsValidPassword(user.Password).Returns(true);

            // act 
            controller.RegisterUser(user);

            // assert
            auditLogger.Received().Log("password is ok, user: " + user.Name);
        }
    }

    public class AutoNSubstituteDataAttribute : AutoDataAttribute
    {
        public AutoNSubstituteDataAttribute() 
            : base(new Fixture()
            .Customize(new AutoNSubstituteCustomization()))
        {
        }
    }

    public class User
    {
        public string Name { get; set; }
        public string Password { get; set; }
    }

    public interface IAuditLogger
    {
        void Log(string message);
    }

    public class Controller
    {
        private readonly IValidator validator;
        private readonly IAuditLogger auditLogger;

        public Controller(IValidator validator, IAuditLogger auditLogger)
        {
            this.validator = validator;
            this.auditLogger = auditLogger;
        }

        public void RegisterUser(User user)
        {
            if (validator.IsValidPassword(user.Password))
            {
                auditLogger.Log("password is ok, user: " + user.Name);
            }
        }
    }

    public interface IValidator
    {
        bool IsValidPassword(string password);
    }
}