'The result of ``ZFSSnapshots.create()`` is a ``Deferred`` that fires
when creation has finished.'

def test_create_result(self):

    reactor = FakeProcessReactor()
    snapshots = ZFSSnapshots(reactor, Filesystem('mypool', None))
    d = snapshots.create('name')
    reactor.processes[0].processProtocol.processEnded(Failure(ProcessDone(0)))
    self.assertEqual(self.successResultOf(d), None)
