anchor.diff:  
       [<Scenario>]
       module ``Given a text line with leading # characters`` =
  -        [<Test>]
  +        [<When>]
           let ``<When> SPACE is pressed after '#' character <Then> the line will be converted into a headline`` () =
               let doc = new FlowDocument(new Paragraph(new Run("# ")))
   
  
positive.code:     module ``Given a headline`` =
          open System.Windows.Markup
  
          [<Test>]
          let ``<When> BACKSPACE is pressed within headline <Then> headline is NOT removed`` () =
              let doc = new FlowDocument(new Paragraph(new Headline("headline")))
  
  
negative.code: 
      [<Scenario>]
      module ``Given a known Ascii symbol`` =
          [<When>]
          let ``<When> "-->" is enteried <Then> it will be replaced by arrow symbol`` () =
              let document = new FlowDocument(new Paragraph(new Run("so -->")))
  
  