anchor.diff:  
   simple_test() ->
     Stats = [
  -    {<<"node1">>,
  +    {ok,<<"node1">>,
         [
           {
             {{127,0,0,1},1234},
  
positive.code:         }
        ]
      },
      {"node2",
        [
          {
            {{127,0,0,1},1234},
  
negative.code:         }
        ]
      },
      {ok,node3,
        [
          {
            {{127,0,0,1},1234},
            1234
          }
        ]
      },
      {bad_node,<<"node4">>}
    ],
    ?assertNotException(_,_,iotlb_stats_json:encode_stats(Stats)).
  