anchor.diff:                     ) ->
     {ok, {{200, []}, [{"Content-Type", "application/json"}], <<"{
       \"ok\": true,
  -    \"extra_value\": \"test\"
  +    \"extra_object\": {
  +        \"key\": \"test\"
  +    },
  +    \"extra_array\": [\"test\"]
   }
   "/utf8>>}}.
   
  
positive.code:                  , _
                   , _
                   , [ {_, _, _, _, {fail, [ { unexpected
                                             , {"/body/extra_value", _, _}
                                             }
                                           ]}}
                     ]
  
negative.code: GET /unexpected-disallow
  < 200
  < Content-Type: application/json
  {
      \"ok\": true,
      \"extra_object\": {
          \"{{_}}\": \"{{unexpected}}\"
      },
      \"extra_array\": [\"{{unexpected}}\"]
  }
  "/utf8>>).
  
  %%%_* Emacs ============================================================
  