尝试为django-rest-passwordreset编写单元测试，但密码似乎不会在测试中更改？

from django.test import TestCase
from django.urls import reverse
from rest_framework import status
from rest_framework.test import APIClient

from myapp.models import User

class PasswordResetTest(TestCase):
    def setUp(self):
        self.client = APIClient()
        self.user = User.objects.create_user(username='testuser', password='old_password')

    def test_password_reset(self):
        # 发送密码重置请求
        reset_url = reverse('password_reset')
        data = {'email': 'testuser@example.com'}
        response = self.client.post(reset_url, data, format='json')

        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(len(mail.outbox), 1)

        # 模拟验证重置链接
        reset_confirm_url = reverse('password_reset_confirm', kwargs={'uidb64': 'uidb64', 'token': 'token'})
        response = self.client.get(reset_confirm_url)

        self.assertEqual(response.status_code, status.HTTP_200_OK)

        # 模拟设置新密码
        reset_confirm_url = reverse('password_reset_confirm', kwargs={'uidb64': 'uidb64', 'token': 'token'})
        data = {'new_password1': 'new_password', 'new_password2': 'new_password'}
        response = self.client.post(reset_confirm_url, data, format='json')

        self.assertEqual(response.status_code, status.HTTP_200_OK)

        # 确认密码已更改
        self.user.refresh_from_db()
        self.assertTrue(self.user.check_password('new_password'))