class_docstr: Dummy Env class for testing.
code: def reset(self):
      self._step = 0
      return np.ones((2,))
  
imports: import os
  from absl.testing import absltest
  import gym
  import numpy
  from trax import test_utils
  from trax.rl import task
label_desc: Use image node_id 1 for calling the DummyEnv obj's underlying member method code with example usage: obj.reset() and returns: np