anchor.diff:      let timestamp = DateTime.UtcNow
       let internalVal = Int 32L
       let externalVal = Int 100L
  +    let machine = String "unit42"
  +    let typ = String "assembly"
   
       let data = { Measurement = "temperature"
                    Tags = Map [ "machine", "unit42"; "type", "assembly" ]
  
positive.code:     // check temperature
      let temperatureSerie = querySingle "SELECT * FROM temperature"
      temperatureSerie.Name =? temperatureData.Measurement
      temperatureSerie.Tags =? temperatureData.Tags
      temperatureSerie.Columns =? ["time"; "external"; "internal"]
      let temperatureValues = Seq.single temperatureSerie.Values
      temperatureValues =? [| String (fmtTimestamp timestamp); temperatureExternal; temperatureInternal |]
  
      // check cpu_load_short
      let cpuSerie = querySingle "SELECT * FROM cpu_load_short"
      cpuSerie.Name =? cpuData.Measurement
      cpuSerie.Tags =? cpuData.Tags
      cpuSerie.Columns =? ["time"; "value"]
      let cpuValues = Seq.single cpuSerie.Values
      cpuValues =? [| String (fmtTimestamp timestamp); cpuLoad |]
  
  [<Test>]
  let ``query have wrong syntax => error in response`` () =
  
negative.code:     let timestamp = DateTime.UtcNow
      let temperatureInternal = Int 1L
      let temperatureExternal = Int 100L
      let machine = "unit42"
      let typ = "assembly"
  
      let cpuLoad = Float 0.64
      let host = "server01"
      let region = "us-west"
  
      let temperatureData = { Measurement = "temperature"
                              Tags = Map [ "machine", machine; "type", typ ]
                              Fields = Map [ "internal", temperatureInternal; "external", temperatureExternal ]
                              Timestamp = Some timestamp }
      let cpuData = { Measurement = "cpu_load_short"
                      Tags = Map [ "host", host; "region", region ]
                      Fields = Map [ "value", cpuLoad ]
                      Timestamp = Some timestamp }
      let points = createFromMany [| temperatureData; cpuData |]
  