anchor.diff:        /// If the timeout is reached the xUnit task will be killed. Default is 5 minutes.
         TimeOut: TimeSpan
         /// The output directory. It's the current directoy if nothing else is specified.
  -      OutputDir: string }
  +      OutputDir: string
  +      /// Test runner error level. Option which allows to specify if an xUnit error should break the build.
  +      ErrorLevel: XUnitErrorLevel }
   
   /// The xUnit default parameters
   let XUnitDefaults =
  
positive.code: open System
  open System.IO
  open System.Text
  
  /// The xUnit parameter type
  type XUnitParams = { 
  
negative.code:       Verbose = true;
        XmlOutput = false;
        TimeOut = TimeSpan.FromMinutes 5.
        OutputDir = null
        ErrorLevel = Error }
  
  /// Runs xUnit unit tests in the given assemblies via the given xUnit runner.
  /// Will fail if the runner terminates with non-zero exit code for any of the assemblies.
  