test_damm.doctest - more detailed doctests for stdnum.damm module
Copyright (C) 2016 Arthur de Jong
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This file contains more detailed doctests for the stdnum.damm module. It
tries to test more corner cases and detailed functionality that is not
really useful as module documentation.
>>> from stdnum import damm
These are normal variations that should just work. Calculating checksums:
>>> damm.checksum('572')
4
>>> damm.checksum('5724')
0
>>> damm.checksum('43881234567')
9
>>> damm.checksum('438812345679')
0
The same numbers but now simply ask for validation:
>>> damm.validate('572')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> damm.validate('5724')
'5724'
>>> damm.validate('43881234567')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> damm.validate('438812345679')
'438812345679'
Adding a check digit to the numbers so they are all valid:
>>> damm.calc_check_digit('572')
'4'
>>> damm.validate('5724')
'5724'
>>> damm.calc_check_digit('5724')
'0'
>>> damm.validate('57240')
'57240'
>>> damm.calc_check_digit('43881234567')
'9'
>>> damm.validate('438812345679')
'438812345679'
>>> damm.calc_check_digit('438812345679')
'0'
>>> damm.validate('4388123456790')
'4388123456790'
We can also use a different table if we really need to. This one is from
http://www.md-software.de/math/DAMM_Quasigruppen.txt
>>> table = (
... (0, 2, 3, 4, 5, 6, 7, 8, 9, 1),
... (2, 0, 4, 1, 7, 9, 5, 3, 8, 6),
... (3, 7, 0, 5, 2, 8, 1, 6, 4, 9),
... (4, 1, 8, 0, 6, 3, 9, 2, 7, 5),
... (5, 6, 2, 9, 0, 7, 4, 1, 3, 8),
... (6, 9, 7, 3, 1, 0, 8, 5, 2, 4),
... (7, 5, 1, 8, 4, 2, 0, 9, 6, 3),
... (8, 4, 6, 2, 9, 5, 3, 0, 1, 7),
... (9, 8, 5, 7, 3, 1, 6, 4, 0, 2),
... (1, 3, 9, 6, 8, 4, 2, 7, 5, 0))
>>> damm.checksum('816', table=table)
9
>>> damm.checksum('8169', table=table)
0