TDD Driving me nuts

gistfile1.cs

public class MainEntryPointClass : BaseClass
{
  private ILogic Logic;
  public MainEntryPointClass(ILogic Logic)
  {
    this.Logic = Logic;
  }

  public MainEntryPointClass () : this(new Logic(new Timer(), new FileLogger()))
  {
  }
  
  public SetupProperties()
  {
     this.ConfigProperties.Add(typeof(string), "DirectoryPath", "C:\\");
  }

  public Run()
  {
    //Set some properties on Logic by reading this.ConfigProperties. This is the first time ConfigProperties can be read.
    Logic.RandomProperty = this.ConfigProperties.Find(..).Value();
  }
}

public class Logic : ILogic
{
   private ITimer Timer;
   private ILogger Logger;

   public class Logic(ITimer Timer, ILogger Logger)
   {
        this.Timer = Timer;
        this.Logger = Logger;
   }

   public SomeMethod()
   {
      this.Logger.Write("Data");  /******* How does DirectoryPath get assigned? *******/
   }
}

public interface IFileLogger
{
    string DirectoryPath { get; set; }
    void WriteData(string Data);        
}

 public class FileLogger : IFileLogger
{
    public void WriteData(string Data)
    {
    }

    public string DirectoryPath { get; set; }
}