def METHOD_NAME(self):
    worker = FakeWorker('worker1')
    yield worker.setServiceParent(self.workers)
    worker.parent = self.master
    worker.manager = self.workers
    worker.botmaster = self.master.botmaster
    worker_new = FakeWorker('worker1')
    self.new_config.workers = [worker_new]
    yield self.workers.reconfigServiceWithBuildbotConfig(self.new_config)
    # worker was not replaced..
    self.assertIdentical(self.workers.workers['worker1'], worker)