def test_group_dict(self):
options = OptionParser()
options.define('a', default=1)
options.define('b', group='b_group', default=2)
frame = sys._getframe(0)
this_file = frame.f_code.co_filename
self.assertEqual(set(['b_group', '', this_file]), options.groups())
b_group_dict = options.group_dict('b_group')
self.assertEqual({'b': 2}, b_group_dict)
self.assertEqual({}, options.group_dict('nonexistent'))
