anchor.diff:      ok.
   
   level_delta_test() ->
  -    application:get_env(riak_core, hashtree_backend, eleveldb),
  +    application:set_env(riak_core, hashtree_backend, eleveldb),
       delta_t().
   rocks_delta_test() ->
  -    application:get_env(riak_core, hashtree_backend, erocksdb),
  +    application:set_env(riak_core, hashtree_backend, erocksdb),
       delta_t().
   
   delta_t() ->
  
positive.code: %% LevelDB store that is used by `compare', therefore isolating the
  %% compare from newer/concurrent insertions into the tree.
  level_snapshot_test() ->
      application:get_env(riak_core, hashtree_backend, eleveldb),
      snapshot_t().
  rocks_snapshot_test() ->
      application:get_env(riak_core, hashtree_backend, erocksdb),
      snapshot_t().
  
  snapshot_t() ->
  
negative.code:     ?assertEqual([{missing, <<"k">>}], Diff2).
  
  level_opened_closed_test() ->
      application:set_env(riak_core, hashtree_backend, eleveldb),
      opened_closed_t().
  
  rocks_opened_closed_test() ->
      application:set_env(riak_core, hashtree_backend, erocksdb),
      opened_closed_t().
  
  opened_closed_t() ->
  