test_issn.doctest - more detailed doctests for stdnum.issn module

Copyright (C) 2010 Arthur de Jong

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

>>> from stdnum import issn


These are tests to check what happes when a wrong type is passed.

>>> issn.is_valid(1857982185) # integer, not string
False
>>> issn.is_valid(None)
False
>>> issn.is_valid('')
False