code: def test_opponent_play_deterministic(self):
      # Chooses the first available space.
      self.assertEqual(
          (0, 0),
          self.env._opponent_play([[0, 0, 0], [0, 0, 0], [0, 0, 1]]),
      )
      self.assertEqual(
          (2, 2),
          self.env._opponent_play([[1, 1, 1], [1, 1, 1], [1, 1, 0]]),
      )
  
file_path: agents/tf_agents/environments/examples/tic_tac_toe_environment_test.py
imports: import numpy
  from tf_agents.environments import utils
  from tf_agents.environments.examples.tic_tac_toe_environment import TicTacToeEnvironment
  from tf_agents.trajectories.time_step import StepType
  from tf_agents.trajectories.time_step import TimeStep
  from tf_agents.utils import test_utils
label_desc: Use image node_id 5 for calling the TicTacToeEnvironmentTest obj's underlying member method code with example usage: obj.test_opponent_play_deterministic() without return types