test_luhn.doctest - more detailed doctests for stdnum.luhn module Copyright (C) 2010, 2011, 2013 Arthur de Jong This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA This file contains more detailed doctests for the stdnum.luhn module. It tries to test more corner cases and detailed functionality that is not really useful as module documentation. >>> from stdnum import luhn These are normal variations that should just work. Calculating checksums: >>> luhn.checksum('4992739871') 9 >>> luhn.checksum('490154203237518') 0 >>> luhn.checksum('abcdefe', alphabet='abcdef') 0 The same numbers but now simply ask for validation: >>> luhn.validate('4992739871') Traceback (most recent call last): ... InvalidChecksum: ... >>> luhn.validate('490154203237518') '490154203237518' >>> luhn.validate('abcdefe', alphabet='abcdef') 'abcdefe' Adding a check digit to the numbers so they are all valid: >>> luhn.calc_check_digit('4992739871') '6' >>> luhn.validate('49927398716') '49927398716' >>> luhn.calc_check_digit('142857') '2' >>> luhn.validate('1428572') '1428572' >>> luhn.calc_check_digit('398438246238642378648236487236482734') '7' >>> luhn.validate('3984382462386423786482364872364827347') '3984382462386423786482364872364827347'