public async Task TestQueryAsync()
        {
            try
            {
                var client = new InfluxDBClient(influxUrl, dbUName, dbpwd);
                var r      = await client.QueryDBAsync("stress", "select * from performance limit 10");

                DateTime d;
                Assert.IsTrue(r != null && DateTime.TryParse(r[0].time, out d), "QueryDBAsync retunred null or invalid data");
            }
            catch (Exception e)
            {
                Assert.Fail("Unexpected exception of type {0} caught: {1}",
                            e.GetType(), e.Message);
                return;
            }
        }
 public async Task TestQueryAsync_MultiSeries()
 {
     var client = new InfluxDBClient(influxUrl, dbUName, dbpwd);
     var r      = await client.QueryDBAsync("_internal", "Show Series");
 }