code: def test_label(self):
      # NliNumWord only has 2 labels: ['entailment', 'non-entailment']
      trans = nli_overlap.transform(sample1)
      self.assertTrue(
          trans[0].y.field_value in ["entailment", "non-entailment"]
      )
  
imports: import unittest
  from textflint.input.component.sample.nli_sample import NLISample
  from textflint.generation.transformation.NLI import Overlap
label_desc: Use image node_id 1 for calling the TestNliOverlap obj's underlying member method code with example usage: obj.test_label() without return types