code: def test_frozen_dict_reduce(self):
      before = FrozenDict(a=FrozenDict(b=1, c=2))
      cl, data = before.__reduce__()
      after = cl(*data)
      self.assertIsNot(before, after)
      self.assertEqual(before, after)
      self.assertEqual(after, {"a": {"b": 1, "c": 2}})
  
file_path: flax/tests/core/core_frozen_dict_test.py
imports: import jax
  from absl.testing import absltest, parameterized
  from flax.core import FrozenDict, copy, freeze, pop, pretty_repr, unfreeze
label_desc: Use image node_id 8 for calling the FrozenDictTest obj's underlying member method code with example usage: obj.test_frozen_dict_reduce() without return types