anchor.diff:  
   
   %% API
  --export([generate_file_id/0, create_test_file/3, read_test_file/3,
  -    update_test_file/3, remove_test_file/4, verify_test_file/4, verify_storage_on_all_nodes/1]).
  +-export([generate_file_id/0, create_test_file/3, update_test_file/3,
  +    remove_test_file/4, verify_test_file/4, verify_storage_on_all_nodes/1]).
   
   -define(TEST_FILE_NAME_LEN, application:get_env(?APP_NAME,
       storage_test_file_name_size, 32)).
  
positive.code: %%--------------------------------------------------------------------
  %% @private
  %% @doc
  %% Create random sequence consisting of lowercase ASCII letters.
  %% @end
  %%--------------------------------------------------------------------
  
negative.code: 
  %%--------------------------------------------------------------------
  %% @doc
  %% Verifies content of storage test file and removes it.
  %% @end
  %%--------------------------------------------------------------------
  -spec verify_test_file(helpers:helper(), helpers:user_ctx(), helpers:file_id(),
  