asciidoc-0.1: test/asciidoctor/stem/with-id-and-role.test

:stem:
[stem, id="sqrt", role="right"]
++++
sqrt(4) = 2
++++
>>>
Document
  { docMeta =
      Meta
        { docTitle = []
        , docTitleAttributes = Nothing
        , docAuthors = []
        , docRevision = Nothing
        , docAttributes = fromList [ ( "sectids" , "" ) , ( "stem" , "" ) ]
        }
  , docBlocks =
      [ Block
          Attr
          ( [] , fromList [ ( "id" , "sqrt" ) , ( "role" , "right" ) ] )
          Nothing
          (MathBlock Nothing "sqrt(4) = 2\n")
      ]
  }