def test_default(self):
        threadpool = reactor.getThreadPool()

        api = UnusableAPI()
        deployer = BlockDeviceDeployer(
            hostname=u"192.0.2.1",
            node_uuid=uuid4(),
            block_device_api=api,
        )

        self.assertEqual(
            _SyncToThreadedAsyncAPIAdapter(
                _reactor=reactor, _threadpool=threadpool, _sync=api
            ),
            deployer.async_block_device_api,
        )
When not otherwise initialized, the attribute evaluates to a
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/test/test_blockdevice.py/BlockDeviceDeployerAsyncAPITests.test_default