code: def test_frozen_items(self):
      xs = {"a": 1, "b": {"c": 2}}
      items = list(freeze(xs).items())
  
      self.assertEqual(items, [("a", 1), ("b", freeze(xs["b"]))])
  
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 6 for calling the FrozenDictTest obj's underlying member method code with example usage: obj.test_frozen_items() without return types