code: def test_exclusion_list(self):
      traceback_util.show_flax_in_tracebacks()
      exclusion_len_wo_flax = len(jax_traceback_util._exclude_paths)
      traceback_util.hide_flax_in_tracebacks()
      exclusion_len_w_flax = len(jax_traceback_util._exclude_paths)
      self.assertLen(
          traceback_util._flax_exclusions,
          exclusion_len_w_flax - exclusion_len_wo_flax,
      )
  
file_path: flax/tests/traceback_util_test.py
imports: import contextlib
  import sys
  import traceback
  import jax
  from absl.testing import absltest
  from jax import numpy
  from jax import random
  from jax._src import traceback_util
  from flax import linen
  from flax import traceback_util
label_desc: Use image node_id 1 for calling the TracebackTest obj's underlying member method code with example usage: obj.test_exclusion_list() without return types