anchor.diff:  %% Stops cover server if it is running.
   %% @end
   %%--------------------------------------------------------------------
  -stop_cover() ->
  +-spec maybe_stop_cover() -> ok.
  +maybe_stop_cover() ->
       case application:get_env(covered_dirs) of
           {ok, []} ->
               ok;
  
positive.code: 
  %% API
  -export([prepare_test_environment/3, clean_environment/1, load_modules/2,
      start_cover/0, stop_cover/0]).
  
  -define(CLEANING_PROC_NAME, cleaning_proc).
  
  
negative.code: %% Starts cover server if needed (if apropriate env is set).
  %% @end
  %%--------------------------------------------------------------------
  -spec maybe_start_cover() -> ok.
  maybe_start_cover() ->
      case application:get_env(covered_dirs) of
          {ok, []} ->
              ok;
  