code: def setUp(self):
      super(UnicodeCharTokenizerOpTest, self).setUp()
      self.tokenizer = UnicodeCharTokenizer()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.platform import test
  from tensorflow_text.python.ops.unicode_char_tokenizer import UnicodeCharTokenizer
label_desc: Use image node_id 1 for calling the UnicodeCharTokenizerOpTest obj's underlying member method code with example usage: obj.setUp() without return types