anchor.diff:      |> Seq.map (fun assembly -> assembly.Attribute(imp "result").Value)
       |> Seq.map (fun x -> x <> "Failure")
       |> Seq.reduce (&&)
  +
  +type NUnitErrorLevel =
  +    | Error
  +    | DontFailBuild
   
   type NUnitParams =
       { IncludeCategory:string;
  
positive.code:               
      let assemblies =  assemblies |> Seq.toArray
  
      let tool = parameters.ToolPath @@ parameters.ToolName
  
      let args = commandLineBuilder parameters assemblies
  
negative.code:       XsltTransformFile:string;
        TimeOut: TimeSpan;
        DisableShadowCopy:bool
        Domain:string
        ErrorLevel:NUnitErrorLevel}
  
  /// NUnit default params  
  let NUnitDefaults =
  