code: def assert_usable(self):
      try:
          output = self.trace(abspath("assert_usable" + self.EXTENSION))
          output = output.strip()
      except (
          FileNotFoundError,
          NotADirectoryError,
          PermissionError,
      ) as fnfe:
          output = str(fnfe)
      if output != "probe: success":
          raise unittest.SkipTest(
              "{}(1) failed: {}".format(self.COMMAND[0], output)
          )
  
imports: import dis
  import os.path
  import re
  import subprocess
  import sys
  import sysconfig
  import types
  import unittest
  from test import support
  from test.support import findfile
label_desc: Use image node_id 5 for calling the TraceBackend obj's underlying member method code with example usage: obj.assert_usable() without return types