anchor.diff:        Run : string list
         /// Doesn't run tests, print out list of tests instead.
         ListTests : bool
  +      /// Custom arguments to use in the case the helper not yet supports them
  +      CustomArgs: string list
         /// Working directory
         WorkingDirectory : string
       }
  +
       override this.ToString() =
           let append (s: string) (sb: StringBuilder) = sb.Append s
           let appendIfTrue p s sb =
  
positive.code:         failedAssemblies
          |> List.map (fun (testAssembly,exitCode) -> sprintf "Expecto test of assembly '%s' failed. Process finished with exit code %d." testAssembly exitCode)
          |> String.concat System.Environment.NewLine
          |> FailedTestsException |> raise
negative.code:         |> appendIfTrue this.Parallel "--parallel "
          |> appendIfTrue this.Summary "--summary "
          |> appendIfTrue (not this.Parallel) "--sequential "
          |> appendIfTrue this.ListTests "--list-tests "
          |> appendIfNotNullOrWhiteSpace this.Filter "--filter "
          |> appendIfNotNullOrWhiteSpace this.FilterTestCase "--filter-test-case "
          |> appendIfNotNullOrWhiteSpace this.FilterTestList "--filter-test-list "
          |> appendList this.Run "--run "
          |> appendList this.CustomArgs ""
          |> toText
  
      static member DefaultParams =
  