test_ch_ssn.doctest - more detailed doctests for stdnum.ch.ssn module

Copyright (C) 2016 Arthur de Jong

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This file contains more detailed doctests for the stdnum.ch.ssn module. It
tries to cover more corner cases and detailed functionality that is not
really useful as module documentation.

>>> from stdnum.ch import ssn


Extra tests for length checking and corner cases:

>>> ssn.validate('54165168')  # valid EAN-8 but incorrect length
Traceback (most recent call last):
    ...
InvalidLength: ...