public void PhotosRecentlyUpdatedTests()
        {
            var sixMonthsAgo = DateTime.Today.AddMonths(-6);
            var photos       = AuthInstance.PhotosRecentlyUpdated(sixMonthsAgo, PhotoSearchExtras.All, 1, 20);

            Assert.IsNotNull(photos);
            Assert.AreEqual(20, photos.PerPage);
            Assert.AreNotEqual(0, photos.Count);

            // Overloads

            photos = AuthInstance.PhotosRecentlyUpdated(sixMonthsAgo);
            photos = AuthInstance.PhotosRecentlyUpdated(sixMonthsAgo, PhotoSearchExtras.DateTaken);
            photos = AuthInstance.PhotosRecentlyUpdated(sixMonthsAgo, 1, 10);
        }