  import sys
  
  from django.core.files.temp import NamedTemporaryFile
  from django.db import DJANGO_VERSION_PICKLE_KEY, models
  from django.test import TestCase, mock
  from django.utils._os import npath, upath
  from django.utils.version import get_version
  
  from .models import Article
  
  
 
</s> remove from .models import Article

 </s> add  </s> remove from django.core.files.temp import NamedTemporaryFile
 </s> add  </s> remove import subprocess
import sys
 </s> add  </s> remove import datetime
import os
 </s> add  </s> remove 
    def test_unpickling_when_appregistrynotready(self):
        """
        #24007 -- Verifies that a pickled model can be unpickled without having
        to manually setup the apps registry beforehand.
        """
        script_template = """#!/usr/bin/env python
import pickle

from django.conf import settings

data = %r

settings.configure(DEBUG=False, INSTALLED_APPS=['model_regress'], SECRET_KEY = "blah")
article = pickle.loads(data)
print(article.headline)"""
        a = Article.objects.create(
            headline="Some object",
            pub_date=datetime.datetime.now(),
            article_text="This is an article",
        )

        with NamedTemporaryFile(mode='w+', suffix=".py") as script:
            script.write(script_template % pickle.dumps(a))
            script.flush()
            # A path to model_regress must be set in PYTHONPATH
            model_regress_dir = os.path.dirname(upath(__file__))
            model_regress_path = os.path.abspath(model_regress_dir)
            tests_path = os.path.split(model_regress_path)[0]
            pythonpath = os.environ.get('PYTHONPATH', '')
            pythonpath = npath(os.pathsep.join([tests_path, pythonpath]))

            with mock.patch.dict('os.environ', {'PYTHONPATH': pythonpath}):
                try:
                    result = subprocess.check_output([sys.executable, script.name])
                except subprocess.CalledProcessError:
                    self.fail("Unable to reload model pickled data")
        self.assertEqual(result.strip().decode(), "Some object")
 </s> add 
from django.test import TestCase
  import sys
  
  from django.core.files.temp import NamedTemporaryFile
  from django.db import DJANGO_VERSION_PICKLE_KEY, models
from django.test import TestCase
from django.test import TestCase
  from django.utils.version import get_version
  
  from .models import Article
  
  
keep keep keep keep replace replace keep keep keep keep keep
 Refs #24007 -- Removed an apps.populate() call in model unpickling that can cause deadlocks. 
tests/model_regress/test_pickle.py