I am trying to extend the IS_NOT_EMPTY validator to strip out
whitespace before submitting.  I have two questions (code posted after
questions):

1. How can I test the custom message constructor?  Right now I always
get the "expected 2 arguments, got 3" error message?
2. I am using doctests and can't tell the difference between
"Expected" and "Got" in this test:
**********************************************************************
File "validators.py", line 14, in __main__.IS_NOT_WHITESPACE
Failed example:
    IS_NOT_WHITESPACE()('   ')
Expected:
    ('', 'cannot be empty!')
Got:
    ('', 'cannot be empty!')
**********************************************************************
1 items had failures:
   1 of   4 in __main__.IS_NOT_WHITESPACE
***Test Failed*** 1 failures.



SOURCE CODE


from gluon.validators import IS_NOT_EMPTY
import string

class IS_NOT_WHITESPACE(IS_NOT_EMPTY):
    """
    Example::
        INPUT(_type='text', _name='name', requires=IS_NOT_WHITESPACE
())

    IS_NOT_WHITESPACE inherits from the IS_NOT_EMPTY validator. It
trims the
    argument, a string, of whitespace before validating:

        >>> IS_NOT_WHITESPACE()(' ')
        ('', 'cannot be empty!')
        >>> IS_NOT_WHITESPACE()('   ')
        ('', 'cannot be empty!')
        >>> IS_NOT_WHITESPACE()('   \t\r')
        ('', 'cannot be empty!')
        >>> IS_NOT_WHITESPACE()(string.whitespace)
        ('', 'cannot be empty!')
    """

    def __call__(self, value):
        return IS_NOT_EMPTY.__call__(self, value.strip())

# Allow doctests to be run if this file is called by python.  For
example:
#     python validators.py
if __name__=='__main__':
   import doctest
   doctest.testmod()

END SOURCECODE

Thanks,
Matthew

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