anchor.diff:      oneof(Cmd0).
   
   
  -%% Pre-Condition
  +%% @doc Pre-Condition
   %%
   precondition(_S, {call,_,_,_}) ->
       true.
   
   
  -%% Next-State
  +%% @doc Next-State
   %%
  -next_state(S, _V, {call,_,put,[_Instance, Key,_Object]}) ->
  +next_state(S, _V, {call,_,put,[_Instance, Key, _Object]}) ->
  +    %% ?debugVal(_V),
       case proplists:is_defined(Key, S#state.stored) of
           false ->
               S#state{stored = S#state.stored ++ [Key]};
  
positive.code: %% @end
  %%====================================================================
  -module(leo_backend_db_prop).
  -include_lib("proper/include/proper.hrl").
  -include_lib("eunit/include/eunit.hrl").
  
  
negative.code:                     begin
                          leo_backend_db_api:new(?INSTANCE_NAME, ?NUM_OF_PROCS, Type, ?DB_PATH),
                          {H,S,Res} = run_commands(?MODULE, Cmds),
  
                          leo_backend_db_api:stop(?INSTANCE_NAME),
                          application:stop(leo_backend_db),
  