tests/test_luhn.doctest


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test_luhn.doctest - more detailed doctests for stdnum.luhn module

Copyright (C) 2010 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.is_valid('4992739871')
False
>>> luhn.is_valid('490154203237518')
True
>>> luhn.is_valid('abcdefe', alphabet='abcdef')
True

Adding a check digit to the numbers so they are all valid:

>>> luhn.calc_check_digit('4992739871')
'6'
>>> luhn.is_valid('49927398716')
True
>>> luhn.calc_check_digit('142857')
'2'
>>> luhn.is_valid('1428572')
True
>>> luhn.calc_check_digit('398438246238642378648236487236482734')
'7'
>>> luhn.is_valid('3984382462386423786482364872364827347')
True