code: def test_positive_tagging_with_bio(self):
      # Given
      tagging_scheme = TaggingScheme.BIO
      slot_name = "animal"
      slot_size = 3
  
      # When
      tags = positive_tagging(tagging_scheme, slot_name, slot_size)
  
      # Then
      expected_tags = [
          BEGINNING_PREFIX + slot_name,
          INSIDE_PREFIX + slot_name,
          INSIDE_PREFIX + slot_name,
      ]
      self.assertListEqual(tags, expected_tags)
  
imports: from __future__ import unicode_literals
  from builtins import range
  from mock import patch
  from snips_nlu.constants import LANGUAGE_EN
  from snips_nlu.preprocessing import Token, tokenize
  from snips_nlu.result import unresolved_slot
  from snips_nlu.slot_filler.crf_utils import BEGINNING_PREFIX, INSIDE_PREFIX, LAST_PREFIX, OUTSIDE, TaggingScheme, UNIT_PREFIX, end_of_bilou_slot, end_of_bio_slot, negative_tagging, positive_tagging, start_of_bilou_slot, start_of_bio_slot, tags_to_slots, utterance_to_sample
  from snips_nlu.tests.utils import SnipsTest
label_desc: Use image node_id 9 for calling the TestCRFUtils obj's underlying member method code with example usage: obj.test_positive_tagging_with_bio() without return types