code: def setUp(self):
      super().setUp()
      self._num_actions = 3
      self._rng_key = jax.random.PRNGKey(42)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import chex
  import jax
  import numpy
  from rlax._src import exploration
label_desc: Use image node_id 1 for calling the GaussianTest obj's underlying member method code with example usage: obj.setUp() without return types