anchor.diff:      
       let doc = NupkgWriter.nuspecDoc (core, optional)
       doc.ToString() 
  +    |> normalizeLineEndings
       |> shouldEqual (normalizeLineEndings result)
   
   [<Test>]
  
positive.code:                        
      let doc = NupkgWriter.nuspecDoc (core, optional)
      doc.ToString()
      |> shouldEqual (normalizeLineEndings result)
  
negative.code:     
      let doc = NupkgWriter.nuspecDoc (core, OptionalPackagingInfo.Epmty)
      doc.ToString()
      |> normalizeLineEndings
      |> shouldEqual (normalizeLineEndings result)
  
  [<Test>]
  