anchor.diff:        XsltTransformFile:string;
         TimeOut: TimeSpan;
         DisableShadowCopy:bool
  -      Domain:string}
  +      Domain:string
  +      ErrorLevel:NUnitErrorLevel}
   
   /// NUnit default params  
   let NUnitDefaults =
  
positive.code:               
      let assemblies =  assemblies |> Seq.toArray
  
      let tool = parameters.ToolPath @@ parameters.ToolName
  
      let args = commandLineBuilder parameters assemblies
  
negative.code:     |> 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;
  