anchor.diff:        Verbosity = Verbosity.Normal
         RunnerType = null
         RunnerExtensions = []
  -      Assemblies = [] 
         HintDirectories = [] 
         PluginDirectories = []
         ApplicationBaseDirectory = null
  
positive.code:                     TestExplorationOptions = addProperties param.TestExplorationOptions (TestExplorationOptions()),
                      TestRunnerOptions = addProperties param.TestRunnerOptions (TestRunnerOptions())
                     )
      param.Assemblies |> Seq.iter launcher.AddFilePattern
  
      let result = launcher.Run()
      log result.ResultSummary
  
negative.code:       /// extensions to use during the test run.
        /// The value must be in the form '[Namespace.]Type,Assembly[;Parameters]'
        RunnerExtensions: string list // use type + parameters instead of descriptor as string?
        HintDirectories: string seq
        PluginDirectories: string seq 
        ApplicationBaseDirectory: DirectoryInfo
  