int worker_port = tensorflow::testing::PickUnusedPortOrDie();
  job_def->mutable_tasks()->at(0) = absl::StrCat("localhost:", worker_port);
  serialized = server_def.SerializeAsString();
  TFE_InitializeLocalOnlyContext(ctx, 0, serialized.data(), serialized.size(),
                                 status);
  EXPECT_EQ(TF_GetCode(status), TF_OK) << TF_Message(status);

  TFE_DeleteContextOptions(opts);