code: def test_GFile(self, write_mode, read_mode):
      test_string = b"testing write and read"
      with tempfile.TemporaryDirectory() as temp_dir_path:
          test_path = os.path.join(temp_dir_path, "test")
  
          with io.override_mode(write_mode):
              with io.GFile(test_path, "wb") as file:
                  file.write(test_string)
  
          with io.override_mode(read_mode):
              with io.GFile(test_path, "rb") as file:
                  self.assertEqual(file.read(), test_string)
  
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 2 for calling the IOTest obj's underlying member method code with example usage: obj.test_GFile(write_mode, read_mode) without return types