public PlayerFeedsSyncResult(
            IEnumerable <PlayerFeedRow> playerFeedRows,
            IEnumerable <PlayerFeed> playerFeeds)
        {
            var playerFeedRowsByID = playerFeedRows.ToDictionary(r => r.Url);
            var playerFeedsByID    = playerFeeds.ToDictionary(f => f.Url);

            DefunctPlayerFeedRows = playerFeedRowsByID.Values
                                    .Where(r => !playerFeedsByID.ContainsKey(r.Url))
                                    .ToArray();
            NewPlayerFeedRows = PlayerFeedRow.CreateRows(playerFeedsByID.Values
                                                         .Where(f => !playerFeedRowsByID.ContainsKey(f.Url)))
                                .ToArray();
        }
        public void CreateRows()
        {
            var playerFeeds = Enumerable.Range(0, 26)
                              .Select(i => new PlayerFeed {
                Url = ((char)('a' + i)).ToString()
            });
            var playerFeedRows = PlayerFeedRow.CreateRows(playerFeeds).ToArray();

            Assert.AreEqual(26, playerFeedRows.Length);
            CollectionAssert.AreEqual(
                playerFeeds.Select(f => f.Url).ToArray(),
                playerFeedRows.Select(r => r.Url).ToArray());
            Assert.IsTrue(playerFeedRows.All(r => r.PartitionKey == "0"));
            Assert.AreEqual(playerFeedRows.Length, playerFeedRows.Select(r => r.RowKey).Distinct().Count());
        }