text: from unittest import mock
  
  from django.contrib import admin
  from django.contrib.auth.admin import UserAdmin
  from django.contrib.auth.models import User
  from django.test import TestCase, override_settings
  from django.urls import path, reverse
  
  
  class Router:
      target_db = None
  
      def db_for_read(self, model, **hints):
          return self.target_db
  
      db_for_write = db_for_read
  
      def allow_relation(self, obj1, obj2, **hints):
          return True
  
  
  site = admin.AdminSite(name="test_adminsite")
  site.register(User, admin_class=UserAdmin)
  
  urlpatterns = [
      path("admin/", site.urls),
  ]
  
  
  @override_settings(ROOT_URLCONF=__name__, DATABASE_ROUTERS=["%s.Router" % __name__])
  class MultiDatabaseTests(TestCase):
      databases = {"default", "other"}
  
      @classmethod
      def setUpTestData(cls):
          cls.superusers = {}
          for db in cls.databases:
              Router.target_db = db
              cls.superusers[db] = User.objects.create_superuser(
                  username="admin",
                  password="something",
                  email="test@test.org",
              )
  
      @mock.patch("django.contrib.auth.admin.transaction")
      def test_add_view(self, mock):
          for db in self.databases:
              with self.subTest(db_connection=db):
                  Router.target_db = db
                  self.client.force_login(self.superusers[db])
                  self.client.post(
                      reverse("test_adminsite:auth_user_add"),
                      {
                          "username": "some_user",
                          "password1": "helloworld",
                          "password2": "helloworld",
                      },
                  )
                  mock.atomic.assert_called_with(using=db)
  