code: def test_ModifyPos(self):
      change = transformation.transform(data_sample, n=1)
      self.assertEqual(len(change), 1)
      original_sents = data_sample.get_sentences("context")
      trans_sents = change[0].get_sentences("context")
      changed = False
      for i in range(len(original_sents)):
          if trans_sents[i] != original_sents[i]:
              changed = True
      self.assertTrue(changed)
  
imports: import unittest
  from textflint.input.component.sample import MRCCnSample
  from textflint.generation.transformation.MRCCN import ModifyPos
label_desc: Use image node_id 1 for calling the TestModifyPos obj's underlying member method code with example usage: obj.test_ModifyPos() without return types