code: def test_number_change(self):
      for i in range(10):
          change, change_label = swap_ins.number_change(
              "一万", ["B", "E"], 0, 1
          )
          self.assertTrue(len(change) == len(change_label))
  
file_path: textflint/test/generation/transformation/CWS/test_cn_swap_num.py
imports: import unittest
  from textflint.generation.transformation.CWS.cn_swap_num import CnSwapNum
  from textflint.input.component.sample.cws_sample import CWSSample
label_desc: Use image node_id 3 for calling the TestCnSwapNum obj's underlying member method code with example usage: obj.test_number_change() without return types