anchor.diff:    {
       Type                        : Type
       Create                      : unit -> TestInstance
  -    Cases                       : seq<TestMethod>
  +    Methods                     : seq<TestMethod>
     }
   
   type TestSuite =
  
positive.code: 
      let tryRunCasesAsync (testObject: TestClass) =
        let results =
          testObject.Cases
          |> Seq.map
            (fun testCase ->
              async { return testObject |> tryRunCase testCase }
  
negative.code:       {
          Type                    = typ
          Create                  = typ |> instantiate
          Methods                 = typ |> testCases
        } |> Some
      else
        None
  