anchor.diff:              sprintf @"%s\%s.trx" parameters.ResultsDir (DateTime.Now.ToString("yyyyMMdd-HHmmss.ff"))
           else 
               null
  -//    trace ("/resultsfile is:" + testResultsFile)
  +
       let cl = 
           new StringBuilder()
           |> appendIfNotNull assembly "/testcontainer:"
  
positive.code:         "mstest.exe"
  
   // TODO: try to use VSTest.Console.exe as well (VS2012 and up only)
  
  /// [omit]
  let toolPath () = 
      match tryFindFile mstestPaths mstestexe with
       | Some path -> path
       | None -> failwith "Cannot find MSTest.exe executable"
  
  /// Parameter type to configure the MSTest.exe
  type MSTestParams = 
  
negative.code:         |> appendIfNotNull testResultsFile "/resultsfile:"
  
      cl.ToString()
  
  
  /// Runs MSTest command line tool on a group of assemblies.
  /// ## Parameters
  