code: def test_silence_warning(self) -> None:
      new_stderr = io.StringIO()
      old_err = sys.stderr
      with self.assertRaises(AssertionError):
          try:
              sys.stderr = new_stderr
              with self.silence_stderr():
                  print("A message", file=sys.stderr)
                  raise AssertionError()
          finally:
              sys.stderr = old_err
      self.assertTrue(new_stderr.getvalue().startswith("A message\n"))
  
file_path: Ax/ax/utils/common/tests/test_testutils.py
imports: import io
  import sys
  from ax.utils.common.base import Base
  from ax.utils.common.testutils import TestCase
label_desc: Use image node_id 4 for calling the TestTestUtils obj's underlying member method code with example usage: obj.test_silence_warning() without return types