code: def test_log_flush():
      stdout_buffer = BytesIO()
      new_stdout = TextIOWrapper(stdout_buffer)
  
      with logger.set_level(logger.level_trace):
          test_msg = "This is a debug message"
          with redirect_stdout(new_stdout):
              logger.debug(test_msg)
              assert test_msg not in stdout_buffer.getvalue().decode(
                  "utf-8"
              )
              logger.flush()
              assert test_msg in stdout_buffer.getvalue().decode(
                  "utf-8"
              )
  
      # Check that logging flush does not error with sys.stdout of None
      with redirect_stdout(None):
          logger.flush()
  
imports: from contextlib import redirect_stdout
  import cuml.internals.logger
  from io import StringIO, TextIOWrapper, BytesIO
label_desc: Use image node_id 3 for calling a global function with example usage: test_log_flush() without return types