def gen_stdout_test_msg(bibfile_data, verbose=False):
    """
    Generate appropriate message for STDOUT

    This method creates the string to be printed to STDOUT from the items of the `bibfile_data` list argument. It generates either a terse or verbose message based on the state of the `verbose` argument.

    :param list bibfile_data: List containing `RefFile`s.
    :param bool verbose: Directive to construct verbose/terse STDOUT string.
    :rtype: str
    """
    msg_list = [bibfile.test_msg(verbose) for bibfile in bibfile_data]
    msg = "\n".join(msg_list)
    return msg