code: def test_is_mixed_alphanum(self):
      self.assertFalse(text_encoder.is_mixed_alphanum("hi"))
      self.assertFalse(text_encoder.is_mixed_alphanum(ZH_HELLO[:-1]))
      self.assertTrue(text_encoder.is_mixed_alphanum("hi."))
      self.assertTrue(text_encoder.is_mixed_alphanum("hi.bye"))
      self.assertTrue(text_encoder.is_mixed_alphanum("hi "))
      self.assertTrue(text_encoder.is_mixed_alphanum(ZH_HELLO))
  
imports: from __future__ import unicode_literals
  import os
  from absl.testing import parameterized
  import numpy
  from tensorflow_datasets import testing
  from tensorflow_datasets.core.deprecated.text import text_encoder
label_desc: Use image node_id 3 for calling the TextEncoderTest obj's underlying member method code with example usage: obj.test_is_mixed_alphanum() without return types