public void when_writing_a_bookmark_a_bookmark_file_is_written_to()
        {
            var sut      = new FileBookmarker();
            var bookmark = sut.GetLatest("test-bookmark");

            sut.Bookmark(bookmark, "testnew-bookmark");
        }
        public void when_getting_the_latest_bookmark_and_no_bookmark_file_exists_the_bookmark_is_null()
        {
            var sut = new FileBookmarker();

            Assert.Null(sut.GetLatest("doesnotexist"));
        }
        public void when_getting_the_latest_bookmark_and_the_bookmark_file_exists_the_bookmark_is_provided()
        {
            var sut = new FileBookmarker();

            Assert.NotNull(sut.GetLatest("test-bookmark"));
        }