code: def tearDown(self):
      contexts = set([self.context])
      while self.sockets:
          sock = self.sockets.pop()
          contexts.add(
              sock.context
          )  # in case additional contexts are created
          sock.close(0)
      for ctx in contexts:
          t = Thread(target=ctx.term)
          t.daemon = True
          t.start()
          t.join(timeout=self.teardown_timeout)
          if t.is_alive():
              # reset Context.instance, so the failure to term doesn't corrupt subsequent tests
              zmq.sugar.context.Context._instance = None
              raise RuntimeError(
                  "context could not terminate, open sockets likely remain in test"
              )
      super(BaseZMQTestCase, self).tearDown()
  
imports: import sys
  import time
  from threading import Thread
  from unittest import TestCase
  from pytest import mark
  import zmq
  from zmq.utils import jsonapi
label_desc: Use image node_id 4 for calling the BaseZMQTestCase obj's underlying member method code with example usage: obj.tearDown() without return types