code: def testResetRewardHistory(self):
      self._decorator.step(None, 1)
      self._decorator.reset()
      six.assertCountEqual(self, self._decorator.reward_history(), [])
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tempfile
  from absl.testing import absltest
  import numpy
  import six
  from PIL import Image
  from python.tests.utils import test_environment_decorator
label_desc: Use image node_id 6 for calling the TestEnvironmentDecoratorTest obj's underlying member method code with example usage: obj.testResetRewardHistory() without return types