def test_returnsDeferredResolver(self):
        deferredResolver = root.bootstrap(StubResolver())
        self.assertIsInstance(deferredResolver, root.DeferredResolver)
L{root.bootstrap} returns an object which is initially a
dataset/ETHPy150Open twisted/twisted/twisted/names/test/test_rootresolve.py/BootstrapTests.test_returnsDeferredResolver