如何为Django管理页面的功能编写测试？

from django.test import TestCase
from django.urls import reverse
from django.contrib.auth.models import User

class AdminPageTest(TestCase):
    def setUp(self):
        # 创建测试用户
        self.user = User.objects.create_superuser(
            username='admin',
            password='admin123',
            email='admin@example.com'
        )
        self.client.login(username='admin', password='admin123')

    def test_admin_page_access(self):
        # 访问管理页面
        response = self.client.get(reverse('admin:index'))
        # 验证页面返回状态码为200
        self.assertEqual(response.status_code, 200)
        # 验证页面包含指定内容
        self.assertContains(response, "Django administration")

    def test_create_user(self):
        # 创建用户
        response = self.client.post(reverse('admin:auth_user_add'), {
            'username': 'testuser',
            'password1': 'test123',
            'password2': 'test123',
        })
        # 验证用户是否创建成功
        self.assertEqual(response.status_code, 302)
        self.assertTrue(User.objects.filter(username='testuser').exists())

    def test_delete_user(self):
        # 创建测试用户
        user = User.objects.create_user(username='testuser', password='test123')
        # 删除用户
        response = self.client.post(reverse('admin:auth_user_delete', args=[user.id]))
        # 验证用户是否删除成功
        self.assertEqual(response.status_code, 302)
        self.assertFalse(User.objects.filter(username='testuser').exists())