anchor.diff:          ("Castle.Core","3.2.0");
           ("FAKE","4.0.0");
           ("log4net","1.2.10")]
  -        |> Seq.sortBy (fun (key,_) -> key)
  +        |> Seq.sortBy fst
           
       result
  -    |> Seq.sortBy (fun (key,_) -> key)
  +    |> Seq.sortBy fst
       |> shouldEqual expected
      
   [<Test>]
  
positive.code:         ("Castle.Core","4.0.0");
          ("FAKE","4.0.1");
          ("log4net","1.2.10")]
          |> Seq.sortBy (fun (key,_) -> key)
  
      result
      |> Seq.sortBy (fun (key,_) -> key)
      |> shouldEqual expected
      
  [<Test>]
  
negative.code:         ("Castle.Core","3.2.0");
          ("FAKE","4.0.1");
          ("log4net","1.2.10")]
          |> Seq.sortBy fst
  
      result
      |> Seq.sortBy fst
      |> shouldEqual expected
      
  [<Test>]
  