code: def test_decay_period(env):
      policy = ConstantPolicy(env.action_space.sample())
      exp_policy = AddGaussianNoise(
          env, policy, total_timesteps=2, max_sigma=1.0, min_sigma=0.0
      )
      assert (
          exp_policy.get_action(None)[0] != policy.get_action(None)[0]
      ).all()
      assert (
          exp_policy.get_action(None)[0] != policy.get_action(None)[0]
      ).all()
      assert (
          exp_policy.get_action(None)[0] == policy.get_action(None)[0]
      ).all()
  
file_path: garage/tests/garage/np/exploration_strategies/test_add_gaussian_noise.py
imports: import collections
  import numpy
  import pytest
  from garage.np.exploration_policies import AddGaussianNoise
  from tests.fixtures.envs.dummy import DummyBoxEnv
label_desc: Use image node_id 3 for calling a global function with example usage: test_decay_period(env) without return types