anchor.diff:  all() ->
       ?ALL([
           create_file,
  +        rename_file,
           delete_file,
           set_json_metadata,
           modify_json_metadata,
  
positive.code: %% tests
  -export([
      create_file/1,
      delete_file/1,
      set_json_metadata/1,
      modify_json_metadata/1,
  
negative.code:     delete_xattr_metadata/1,
      delete_file_with_xattr_metadata/1,
      modify_xattr_many_times/1,
      modify_metadata_and_rename_file/1,
      changes_should_be_submitted_to_all_harvesters_and_indices_subscribed_for_the_space/1,
      changes_from_all_subscribed_spaces_should_be_submitted_to_the_harvester/1,
      each_provider_should_submit_only_local_changes_to_the_harvester/1,
  