R. David Murray <rdmur...@bitdance.com> added the comment:

What I had in mind for the second test was something that did this (which I 
think is legal from reading the docs):

   parser.add_argument('foo')
   parser.add_argument('bar', nargs='?', default='eggs')
   with assertRaisesRegex(ArgumentParseError) as cm:
       parser.parse_args([])
   self.assertNotIn('bar', str(cm.exception))

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10424>
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