docstr: Checks that the Checkpointer class saves and restores as expected.
docstr_tok: ["Checks","that","the","Checkpointer","class","saves","and","restores","as","expected","."]
code: def test_checkpointer(self):
      """Checks that the Checkpointer class saves and restores as expected."""
  
      with mock.patch.object(paths, "get_unique_id") as mock_unique_id:
          mock_unique_id.return_value = ("test",)
  
          # Given a path and some stateful object...
          directory = self.get_tempdir()
          x = DummySaveable(self._test_state)
  
          # If we checkpoint it...
          checkpointer = savers.Checkpointer(
              x, directory, time_delta_minutes=0
          )
          checkpointer.save()
  
          # The checkpointer should restore the object's state.
          x.state = None
          checkpointer.restore()
          nest_assert_equal(x.state, self._test_state)
  
          # Checkpointers should also attempt a restore at construction time.
          x.state = None
          savers.Checkpointer(x, directory, time_delta_minutes=0)
          nest_assert_equal(x.state, self._test_state)
  
file_path: acme/acme/jax/savers_test.py
imports: from unittest import mock
  from acme import core
  from acme.jax import savers
  from acme.testing import test_utils
  from acme.utils import paths
  import jax.numpy
  import numpy
  import tree
  from absl.testing import absltest
label_desc: Use image node_id 3 for calling the SaverTest obj's underlying member method code with example usage: obj.test_checkpointer() without return types