text: import os
  import shutil
  import tempfile
  
  from django import conf
  from django.test import SimpleTestCase
  from django.test.utils import extend_sys_path
  
  
  class TestStartProjectSettings(SimpleTestCase):
      def setUp(self):
          self.temp_dir = tempfile.TemporaryDirectory()
          self.addCleanup(self.temp_dir.cleanup)
          template_settings_py = os.path.join(
              os.path.dirname(conf.__file__),
              'project_template',
              'project_name',
              'settings.py-tpl',
          )
          test_settings_py = os.path.join(self.temp_dir.name, 'test_settings.py')
          shutil.copyfile(template_settings_py, test_settings_py)
  
      def test_middleware_headers(self):
          """
          Ensure headers sent by the default MIDDLEWARE don't inadvertently
          change. For example, we never want "Vary: Cookie" to appear in the list
          since it prevents the caching of responses.
          """
          with extend_sys_path(self.temp_dir.name):
              from test_settings import MIDDLEWARE
  
          with self.settings(
              MIDDLEWARE=MIDDLEWARE,
              ROOT_URLCONF='project_template.urls',
          ):
              response = self.client.get('/empty/')
              headers = sorted(response.serialize_headers().split(b'\r\n'))
              self.assertEqual(headers, [
                  b'Content-Length: 0',
                  b'Content-Type: text/html; charset=utf-8',
                  b'X-Content-Type-Options: nosniff',
                  b'X-Frame-Options: DENY',
              ])
  