code: def testGeneratesStacktrace(self):
      if FLAGS.child:
          return
  
      # Subprocess sys.argv[0] with --child=True
      if sys.executable:
          child_process = subprocess.Popen(
              [sys.executable, sys.argv[0], "--child=True"],
              cwd=os.getcwd(),
              stdout=subprocess.PIPE,
              stderr=subprocess.PIPE,
          )
      else:
          child_process = subprocess.Popen(
              [sys.argv[0], "--child=True"],
              cwd=os.getcwd(),
              stdout=subprocess.PIPE,
              stderr=subprocess.PIPE,
          )
  
      # Capture its output. capture both stdout and stderr and append them.
      # We are not worried about timing or order of messages in this test.
      child_stdout, child_stderr = child_process.communicate()
      child_output = child_stdout + child_stderr
  
      # Make sure the child process is dead before we proceed.
      child_process.wait()
  
      logging.info("Output from the child process:")
      logging.info(child_output)
  
      # Verify a stack trace is printed.
      self.assertIn(b"PyEval_EvalFrame", child_output)
  
file_path: tensorflow/tensorflow/python/platform/stacktrace_handler_test.py
imports: import argparse
  import os
  import signal
  import subprocess
  import sys
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 2 for calling the StacktraceHandlerTest obj's underlying member method code with example usage: obj.testGeneratesStacktrace() without return types