anchor.diff:  
   -module(riak_fs_backend).
   -export([start/1,stop/1,get/2,put/3,list/1,list_bucket/2,delete/2]).
  +-include_lib("eunit/include/eunit.hrl").
   % @type state() = term().
   -record(state, {dir}).
   
  
positive.code:     clean(base64:encode_to_string(atom_to_list(Bucket))).
  
  decode_bucket(B64) ->
      list_to_binary(base64:decode_to_string(dirty(B64))).
  
  encode_key(Key) ->
      clean(base64:encode_to_string(Key)).
  
negative.code:     ["0","0",[N3a,N3b]];
  nest(_) ->
      ["0","0","0"].
  
  %%
  %% Test
  %%
  
  simple_test() ->
      application:set_env(riak, riak_fs_backend_root,
                          "test/fs-backend"),
      ?assertCmd("rm -rf test/fs-backend"),
      riak_test_util:standard_backend_test(riak_fs_backend).
  