Arthur de Jong

Open Source / Free Software developer

summaryrefslogtreecommitdiffstats
path: root/tests/test_luhn.doctest
blob: 7c76a3a5908c95b8f8aa5e9638e1a404b6a00139 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
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


Furthermore the is_valid() method should be fairly robust against invalid
junk passed:

>>> luhn.is_valid(None)
False
>>> luhn.is_valid('')
False
>>> luhn.is_valid(0)
False
>>> luhn.is_valid(object())
False
>>> luhn.is_valid('65a4')
False