public void DbOverrideSimpleBatchTest(int concurrencyCount)
        {
            string      tmpFile = string.Empty;
            MultiDbData multiData;

            try
            {
                (tmpFile, multiData) = GetMultiDbData();
                var    flattened      = Concurrency.FlattenOverride(multiData);
                int    totalRowCount  = flattened.Count();
                double expectedChunks = Math.Ceiling((double)totalRowCount / (double)concurrencyCount);
                int    lastBatchSize  = totalRowCount;

                var output = Concurrency.ConcurrencyByInt(multiData, concurrencyCount);
                Assert.IsTrue(expectedChunks <= output[0].Count() && output[0].Count() >= expectedChunks - 1);
                Assert.AreEqual(concurrencyCount, output.Count());
                // Assert.AreEqual(lastBatchSize, output.Last().Count());
            }
            finally
            {
                if (File.Exists(tmpFile))
                {
                    File.Delete(tmpFile);
                }
            }
        }