def METHOD_NAME(missing: typing.Collection[str]) -> None:
    """Formats and outputs an error message listing missing tests."""
    this_file = os.path.relpath(__file__)
    example = random.sample(tuple(missing), 1)[0]
    if example.startswith('mocknet/'):
        example = 'mocknet ' + example
    else:
        example = 'pytest ' + example
    msg = '''\