code: def test_exists(self):
      with tempfile.NamedTemporaryFile() as temp_file:
          with io.override_mode(io.BackendMode.DEFAULT):
              default_exists = io.exists(temp_file.name)
  
          with io.override_mode(io.BackendMode.TF):
              tf_exists = io.exists(temp_file.name)
  
          self.assertEqual(default_exists, tf_exists)
  
imports: import os
  import tempfile
  import jax
  import tensorflow
  from absl.testing import absltest, parameterized
  from flax import errors, io
label_desc: Use image node_id 9 for calling the IOTest obj's underlying member method code with example usage: obj.test_exists() without return types