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: verify_test_file(Helper, UserCtx, FileId, ExpectedFileContent) ->
      case read_test_file(Helper, UserCtx, FileId) of
          ExpectedFileContent ->
              remove_test_file(Helper, UserCtx, FileId, byte_size(ExpectedFileContent)),
              ok;
          UnexpectedFileContent ->
              {error, {storage_test_file, {ExpectedFileContent, UnexpectedFileContent}}}
  