code: def test_replace_en(self):
      self.assertRaises(
          AssertionError, sample.replace_en, [], [8, 8], data["x"]
      )
      self.assertRaises(
          AssertionError, sample.replace_en, "PERSON", [], data["x"]
      )
      self.assertRaises(
          AssertionError, sample.replace_en, "PERSON", [8, 8], []
      )
      token, length = sample.replace_en("PERSON", [8, 8], data["x"])
      self.assertTrue(token != data["x"])
      self.assertTrue(isinstance(length, int))
  
file_path: textflint/test/generation/transformation/RE/test_entity_swap.py
imports: import unittest
  from textflint.input.component.sample.re_sample import RESample
  from textflint.generation.transformation.RE.swap_ent import SwapEnt
label_desc: Use image node_id 1 for calling the TestEntitySwap obj's underlying member method code with example usage: obj.test_replace_en() without return types