code: def _capture_output(self) -> None:
      self.test_out = io.StringIO()
      self.original_output = sys.stdout
      sys.stdout = self.test_out
  
imports: import io
  import sys
  from typing import List
  from unittest import TestCase
label_desc: Use image node_id 1 for calling the CaptureOutputBase obj's underlying member method code with example usage: obj._capture_output() without return types