code: def test_valid_args_chief_worker(self):
      validate.validate(
          entry_point=self.script_entry_point,
          distribution_strategy="auto",
          requirements_txt=self.requirements_file,
          chief_config=machine_config.COMMON_MACHINE_CONFIGS["K80_1X"],
          worker_config=machine_config.COMMON_MACHINE_CONFIGS["K80_1X"],
          worker_count=1,
          entry_point_args=None,
          stream_logs=True,
          docker_image_build_bucket=None,
          called_from_notebook=False,
      )
  
imports: import os
  from absl.testing import absltest
  from tensorflow_cloud.core import machine_config
  from tensorflow_cloud.core import validate
  from tensorflow_cloud.core.tests.unit import constants
label_desc: Use image node_id 2 for calling the TestValidate obj's underlying member method code with example usage: obj.test_valid_args_chief_worker() without return types