#!/usr/bin/env python3
""" Test handling of long filenames in email attachments. """

from email.policy import SMTP


def run_test():
    """ Run the test. """
    for count in range(1, 32):
        folded_header = SMTP.fold(
            'Content-Disposition',
            'attachment; filename="{}.txt"'.format('_'.join(['TEST'] * count))
        )
        print(folded_header)
        for line_num, header_line in enumerate(folded_header.splitlines()[1:]):
            if not header_line.startswith(' '):
                print(
                    "Line {} does not start with a space!".format(line_num + 2)
                )
                print()

        print()

if __name__ == '__main__':
    run_test()