class_docstr: Testing the early stopping utilities functionality that is not tested in
  main `AxClient` testing suite (`TestServiceAPI`).
code: def setUp(self) -> None:
      self.branin_experiment = get_branin_experiment()
  
file_path: Ax/ax/service/tests/test_early_stopping.py
imports: from typing import Dict, Optional
  from ax.service.utils import early_stopping
  from ax.utils.common.testutils import TestCase
  from ax.utils.testing.core_stubs import DummyEarlyStoppingStrategy, get_branin_experiment
label_desc: Use image node_id 1 for calling the TestEarlyStoppingUtils obj's underlying member method code with example usage: obj.setUp() without return types