code: def test_multiple_keys(self):
      init_fn, _ = hk.without_apply_rng(hk.transform(dummy_network))
      params = init_fn(jax.random.PRNGKey(1), jnp.zeros(shape=(1, 32)))
      steps = jnp.zeros(shape=1)
      variables = {"network": params, "steps": steps}
      variable_source = fakes.VariableSource(
          variables, use_default_key=False
      )
      variable_client = variable_utils.VariableClient(
          variable_source, key=["network", "steps"]
      )
      variable_client.update_and_wait()
  
      tree.map_structure(
          np.testing.assert_array_equal,
          variable_client.params[0],
          params,
      )
      tree.map_structure(
          np.testing.assert_array_equal,
          variable_client.params[1],
          steps,
      )
  
file_path: acme/acme/jax/variable_utils_test.py
imports: from acme.jax import variable_utils
  from acme.testing import fakes
  import haiku
  import jax
  import jax.numpy
  import numpy
  import tree
  from absl.testing import absltest
label_desc: Use image node_id 2 for calling the VariableClientTest obj's underlying member method code with example usage: obj.test_multiple_keys() without return types