How do I use IoC in a setup like this Is there a better way to test this

public interface IBlogRepository : IRepository
{
	Post GetPostById(Guid postId);
	Post GetPostByFriendlyUrl(string friendlyUrl);

	List<Post> GetPostsByAuthor(string userName);
	List<Post> GetPostByTags(params string[] tags);
	List<Author> Authors { get; }

	void Delete(Post post);
	void Delete(Comment comment);
	void Save(Post post);
	void Save(Comment comment);
}

public XmlBlogRepository(string dataPath, IFileReader fileReader, IDirectoryReader directoryReader, ILogger logger)
	{
		this.dataPath = dataPath;
		this.fileReader = fileReader;
		this.directoryReader = directoryReader;
		this.Logger = logger;
	}