code: def test_generate(self):
      # test MultiPOSSwap transformation
      gene = POSGenerator(
          trans_methods=["SwapMultiPOS"],
          sub_methods=[],
          trans_config={"SwapMultiPOS": [{"treebank_tag": "NN"}]},
      )
      for original_samples, trans_rst, trans_type in gene.generate(
          dataset
      ):
          self.assertEqual(2, len(original_samples))
          self.assertEqual(2, len(trans_rst))
          for index in range(2):
              self.assertTrue(trans_rst[index].get_mask("x")[-1] == 2)
              self.assertTrue(
                  trans_rst[index].get_words("x")[-1]
                  != original_samples[index].get_words("x")[-1]
              )
  
      # test PrefixSwap transformation
      gene = POSGenerator(trans_methods=["SwapPrefix"], sub_methods=[])
      for original_samples, trans_rst, trans_type in gene.generate(
          dataset
      ):
          self.assertEqual(2, len(original_samples))
          self.assertEqual(2, len(trans_rst))
          for index in range(2):
              self.assertTrue(trans_rst[index].get_mask("x")[-2] == 2)
              self.assertTrue(
                  trans_rst[index].get_words("x")[-2]
                  != original_samples[index].get_words("x")[-2]
              )
  
      # test wrong trans_methods
      gene = POSGenerator(
          trans_methods=["wrong_transform_method"], sub_methods=[]
      )
      self.assertRaises(ValueError, next, gene.generate(dataset))
      gene = POSGenerator(trans_methods=["AddSubtree"], sub_methods=[])
  
      self.assertRaises(ValueError, next, gene.generate(dataset))
      gene = POSGenerator(trans_methods="OOV", sub_methods=[])
      self.assertRaises(ValueError, next, gene.generate(dataset))
  
      # test empty dataset
      self.assertRaises(ValueError, next, gene.generate(Dataset("POS")))
  
      # test empty sample
      self.assertRaises(
          ValueError, next, gene.generate(special_dataset)
      )
  
imports: import unittest
  from textflint.input.dataset import Dataset
  from textflint.generation.generator.pos_generator import POSGenerator
label_desc: Use image node_id 1 for calling the TestPOSGenerate obj's underlying member method code with example usage: obj.test_generate() without return types