code: def test_transformation(self):
      trans_sample = swap_ins.transform(data_sample, n=10)
      for sample in trans_sample:
          for i in range(len(data_sample.get_value("x"))):
              if sample.mask[i] == 0:
                  self.assertTrue(
                      sample.get_value("x")[i]
                      == data_sample.get_value("x")[i]
                  )
          sample.dump()
  
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 4 for calling the TestCnSwapNum obj's underlying member method code with example usage: obj.test_transformation() without return types