code: def test_copy(self):
      test_string = b"testing copy"
      with tempfile.TemporaryDirectory() as temp_dir_path:
          test_path = os.path.join(temp_dir_path, "test")
          copy1_path = os.path.join(temp_dir_path, "copy1")
          copy2_path = os.path.join(temp_dir_path, "copy2")
  
          with io.GFile(test_path, "wb") as file:
              file.write(test_string)
  
          with io.override_mode(io.BackendMode.DEFAULT):
              io.copy(test_path, copy1_path)
  
          with io.override_mode(io.BackendMode.TF):
              io.copy(copy1_path, copy2_path)
  
          with io.GFile(copy2_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 5 for calling the IOTest obj's underlying member method code with example usage: obj.test_copy() without return types