anchor.diff:        | Some t -> t
         | None -> TestList ([], Normal)
       let config, isList = args |> ExpectoConfig.fillFromArgs config
  -    if isList then listTests tests else runTests config tests+    if isList then listTests tests; 0 else runTests config tests
positive.code:     | Parallel
      | Debug
      | Filter of hiera:string
      | FilterTestList of substring:string
      | FilterTestCase of substring:string
      | ListTests
  
      interface IArgParserTemplate with
        member s.Usage =
  
negative.code:             ignoreMissing = true,
              ignoreUnrecognized = true,
              raiseOnUsage = false)
          let isList = parsed.Contains <@ List_Tests @>
          (baseConfig, parsed.GetAllResults()) ||> Seq.fold (flip reduceKnown), isList
  
    /// Prints out names of all tests for given test suite.
    let listTests test =
      test
      |> Test.toTestCodeList
      |> Seq.iter (fst3 >> printfn "%s")
  
    /// Runs tests with supplied options. Returns 0 if all tests passed, =
    /// otherwise 1
  