code: def test_repr(self):
      g = GenericTuple(1, "a", (2, "b"))
      c = cursor(
          {
              "a": {
                  1: {(2, 3): "z", 4: g, "6": (7, 8)},
                  "b": [1, 2, 3],
              },
              "z": -1,
          }
      )
      self.assertEqual(
          repr(c),
          """Cursor(
    _obj={'a': {1: {(2, 3): 'z', 4: GenericTuple(x=1, y='a', z=(2, 'b')), '6': (7, 8)}, 'b': [1, 2, 3]}, 'z': -1},
    _changes={}
  )""",
      )
  
      # test overwriting
      c["z"] = -2
      c["z"] = -3
      c["a"]["b"][1] = -2
      c["a"]["b"] = None
  
      # test deep mutation
      c["a"][1][4].x = (2, 4, 6)
      c["a"][1][4].z[0] = flax.core.freeze(
          {"a": 1, "b": {"c": 2, "d": 3}}
      )
  
      self.assertEqual(
          repr(c),
          """Cursor(
    _obj={'a': {1: {(2, 3): 'z', 4: GenericTuple(x=1, y='a', z=(2, 'b')), '6': (7, 8)}, 'b': [1, 2, 3]}, 'z': -1},
    _changes={
      'z': Cursor(
             _obj=-3,
             _changes={}
           ),
      'a': Cursor(
             _obj={1: {(2, 3): 'z', 4: GenericTuple(x=1, y='a', z=(2, 'b')), '6': (7, 8)}, 'b': [1, 2, 3]},
             _changes={
               'b': Cursor(
                      _obj=None,
                      _changes={}
                    ),
               1: Cursor(
                    _obj={(2, 3): 'z', 4: GenericTuple(x=1, y='a', z=(2, 'b')), '6': (7, 8)},
                    _changes={
                      4: Cursor(
                           _obj=GenericTuple(x=1, y='a', z=(2, 'b')),
                           _changes={
                             'x': Cursor(
                                    _obj=(2, 4, 6),
                                    _changes={}
                                  ),
                             'z': Cursor(
                                    _obj=(2, 'b'),
                                    _changes={
                                      0: Cursor(
                                           _obj=FrozenDict({
                                               a: 1,
                                               b: {
                                                   c: 2,
                                                   d: 3,
                                               },
                                           }),
                                           _changes={}
                                         )
                                    }
                                  )
                           }
                         )
                    }
                  )
             }
           )
    }
  )""",
      )
  
imports: import dataclasses
  from typing import Any, NamedTuple
  import jax
  import jax.numpy
  import optax
  from absl.testing import absltest
  import flax
  import flax.linen
  from flax.core import freeze
  from flax.cursor import AccessType, _traverse_tree, cursor
  from flax.errors import CursorFindError, TraverseTreeError
  from flax.training import train_state
label_desc: Use image node_id 1 for calling the CursorTest obj's underlying member method code with example usage: obj.test_repr() without return types