code: def test_discrete(self):
      env = wrappers.SinglePrecisionWrapper(
          fakes.DiscreteEnvironment(
              action_dtype=np.int64,
              obs_dtype=np.int64,
              reward_spec=specs.Array(dtype=np.float64, shape=()),
          )
      )
  
      self.assertTrue(
          np.issubdtype(env.observation_spec().dtype, np.int32)
      )
      self.assertTrue(np.issubdtype(env.action_spec().dtype, np.int32))
      self.assertTrue(
          np.issubdtype(env.reward_spec().dtype, np.float32)
      )
      self.assertTrue(
          np.issubdtype(env.discount_spec().dtype, np.float32)
      )
  
      timestep = env.reset()
      self.assertIsNone(timestep.reward)
      self.assertIsNone(timestep.discount)
      self.assertTrue(
          np.issubdtype(timestep.observation.dtype, np.int32)
      )
  
      timestep = env.step(0)
      self.assertTrue(np.issubdtype(timestep.reward.dtype, np.float32))
      self.assertTrue(
          np.issubdtype(timestep.discount.dtype, np.float32)
      )
      self.assertTrue(
          np.issubdtype(timestep.observation.dtype, np.int32)
      )
  
file_path: acme/acme/wrappers/single_precision_test.py
imports: from acme import wrappers
  from acme.testing import fakes
  from dm_env import specs
  import numpy
  from absl.testing import absltest
label_desc: Use image node_id 2 for calling the SinglePrecisionTest obj's underlying member method code with example usage: obj.test_discrete() without return types