def set_flags(self, flags):
        self._info = '2,' + ''.join(sorted(flags))
L{FakeRequest.fields} is C{None} for all fake requests.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/MaildirMessage.set_flags--crossover with--dataset/ETHPy150Open twisted/nevow/nevow/test/test_testutil.py/TestFakeRequest.test_fields