Mephisto NSpec

describe_FileTransformer.cs

using System;
using Castle.Core.Logging;
using System.Collections.Generic;
using NSpec;
using NSubstitute;

namespace Mephisto.Services
{
    class describe_FileTransformer : nspec
    {
        void before_each()
        {
            logger = Substitute.For<ILogger>();
            reader = Substitute.For<IFileReader>();
            writer = Substitute.For<IFileWriter>();
            reader.Read().Returns(new[] { new CashFlow() });
            transformer = new FileTransformer(reader, writer) { Logger = logger };
        }

        void when_shazaming()
        {
            act = () => transformer.Shazam();

            specify = () => logger.Received().Info(Arg.Any<String>());

            specify = () => reader.Received().Read();

            specify = () => writer.Received().Write(Arg.Any<IEnumerable<CashFlow>>());
        }

        ILogger logger;
        IFileReader reader;
        IFileWriter writer;
        FileTransformer transformer;
    }

    public class FileTransformer
    {
        IFileReader reader;
        IFileWriter writer;

        public ILogger Logger { get; set; }

        public FileTransformer(IFileReader reader, IFileWriter writer)
        {
            this.reader = reader;
            this.writer = writer;
        }

        public void Shazam()
        {
            Logger.Info("Mephisto: I am tranforming your file.");
            writer.Write(reader.Read());
        }
    }

    public interface IFileWriter
    {
        void Write(object read);
    }

    public interface IFileReader
    {
        object Read();
    }

    public class CashFlow
    {
    }
}