def test_GROUP(self):
        self.transport.clear()
        self.server.do_GROUP('alt.test.nntp')
        self.assertEqual(
            self.transport.value().split('\r\n'), [
                '211 0 1 0 alt.test.nntp group selected',
                ''])
When L{NNTPServer} receives a I{GROUP} command, it sends a line of
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/news/test/test_nntp.py/NNTPTestCase.test_GROUP