anchor.diff:  %%--------------------------------------------------------------------
   %% @private
   %% @doc
  +%% Returns content of storage test file.
  +%% @end
  +%%--------------------------------------------------------------------
  +-spec read_test_file(helpers:helper(), helpers:user_ctx(), helpers:file_id()) ->
  +    Content :: binary().
  +read_test_file(Helper, UserCtx, FileId) ->
  +    Handle = helpers:get_helper_handle(Helper, UserCtx),
  +    {ok, FileHandle} = helpers:open(Handle, FileId, read),
  +    {ok, Content} = helpers:read(FileHandle, 0, ?TEST_FILE_CONTENT_LEN),
  +    ok = helpers:release(FileHandle),
  +    Content.
  +
  +%%--------------------------------------------------------------------
  +%% @private
  +%% @doc
   %% Create random sequence consisting of lowercase ASCII letters.
   %% @end
   %%--------------------------------------------------------------------
  
positive.code: verify_test_file(Helper, UserCtx, FileId, ExpectedFileContent) ->
      case read_test_file(Helper, UserCtx, FileId) of
          ExpectedFileContent ->
              ok;
          UnexpectedFileContent ->
              {error, {storage_test_file, {ExpectedFileContent, UnexpectedFileContent}}}
  
negative.code: 
  
  %% API
  -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)).
  