def pytest_report_collectionfinish(config, startdir, items):
    """
    .. versionadded:: 3.2

    return a string or list of strings to be displayed after collection has finished successfully.

    This strings will be displayed after the standard "collected X items" message.

    :param _pytest.config.Config config: pytest config object
    :param startdir: py.path object with the starting dir
    :param items: list of pytest items that are going to be executed; this list should not be modified.
    """
