code: def call_job_fn(self, key, job_fn, args, context):
      pid = super().call_job_fn(key, job_fn, args, context)
      self.running_jobs.append(pid)
      return pid
  
file_path: dash/tests/integration/long_callback/utils.py
imports: import os
  import shutil
  import subprocess
  import tempfile
  import time
  from contextlib import contextmanager
  import psutil
  import redis
  from dash.long_callback import DiskcacheManager
label_desc: Use image node_id 2 for calling the TestDiskCacheManager obj's underlying member method code with example usage: obj.call_job_fn(key, job_fn, args, context) and returns: pid