code: def test_native_to_unicode(self):
      s = r"foo bar"
      s_unicode = text_encoder.native_to_unicode(s)
      self.assertEqual(s_unicode, "foo bar")
  
imports: import collections
  import io
  import os
  import random
  import shutil
  import string
  import mock
  from six.moves import range
  import tensorflow.compat.v1
  from trax.data import text_encoder
label_desc: Use image node_id 1 for calling the NativeToUnicodeTest obj's underlying member method code with example usage: obj.test_native_to_unicode() without return types