'Check same msg for Exceptions with 1 arg'

def test_1_arg(self):

    for arg in ('foo', u'foo'):
        self.check_same_msg(Exception(arg), arg)
    e = Exception(u'f\xf6\xf6')
    self.assertRaises(UnicodeEncodeError, str, e)
    self.assertEqual(unicode(e), u'f\xf6\xf6')
