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"Cross-Origin-Opener-Policy: same-origin",

                    b"Referrer-Policy: same-origin",

                    b"X-Content-Type-Options: nosniff",

                    b"X-Frame-Options: DENY",

                ],

            )