Django 单元测试 - 如何断言自定义管理器调用 UserManager.create_user 方法？

Question

我是 Python 和 Django 中单元测试和模拟的新手。

这是我的模型（简化）：

from django.db import models
from django.contrib.auth.models import User


class KangaUserManager(models.Manager):
    def create(self, username, email, password, last_name, first_name, request, registered=True, send_confirmation=True):
        kanga_user = KangaUser()
        kanga_user.user = User.objects.create_user(
            username=username,
            email=email,
            password=password,
            first_name=first_name,
            last_name=last_name
        )
        return kanga_user

class KangaUser(models.Model):
    objects = KangaUserManager()

    user = models.OneToOneField(User)

我想断言 User.objects.create_user 被调用，但没有实际调用它。我认为应该使用模拟库，但我什么也没得到。

我尝试过类似的事情：

def test_create(self):
    with mock.patch('django.contrib.auth.models.UserManager') as usermanager_mock:
        kangauser_manager = KangaUserManager()
        kangauser_manager.create(self.username, self.email, self.password, self.last_name, self.first_name, self.request, self.registered, self.send_confirmation)

        self.assertTrue(usermanager_mock.create_user.called)

还有那个（还有很多我不记得的事情：D）

def test_create(self):
    with mock.patch('django.contrib.auth.models.User') as user_mock:
        user_mock.objects = mock.MagicMock()
        user_mock.objects.create_user = mock.MagicMock()

        kangauser_manager = KangaUserManager()
        kangauser_manager.create(self.username, self.email, self.password, self.last_name, self.first_name, self.request, self.registered, self.send_confirmation)

        self.assertTrue(user_mock.objects.create_user.called)

但我总是最终看到该方法没有被调用

我究竟做错了什么 ？

（编辑1：添加了一些导入）

编辑2：

在进行 Alex martelli 建议的改编时，我遇到了另一个错误，

ValueError: Cannot assign "<MagicMock name='User.objects.create_user()' id='55229392'>": "KangaUser.user" must be a "User" instance.

这是改编后的代码：

from django.db import models
from django.contrib.auth import models as auth_model


class KangaUserManager(models.Manager):
    def create(self, username, email, password, last_name, first_name, request, registered=True, send_confirmation=True):
        kanga_user = KangaUser()
        kanga_user.user = auth_model.User.objects.create_user(
            username=username,
            email=email,
            password=password,
            first_name=first_name,
            last_name=last_name
        )
        return kanga_user

class KangaUser(models.Model):
    objects = KangaUserManager()

    user = models.OneToOneField(auth_model.User)

Answer 1

好的，感谢 Alex 和 Aaron，我得到了让它按我想要的方式工作所需的线索，谢谢！

所以，这是代码

from django.db import models
from django.contrib.auth import models as auth_model


class KangaUserManager(models.Manager):
    def create(self, username, email, password, last_name, first_name, request, registered=True, send_confirmation=True):
        kanga_user = KangaUser()
        kanga_user.user = auth_model.User.objects.create_user(
            username=username,
            email=email,
            password=password,
            first_name=first_name,
            last_name=last_name
        )
        return kanga_user

class KangaUser(models.Model):
    objects = KangaUserManager()

    user = models.OneToOneField(auth_model.User)

以及有效的测试：

def test_create(self):
    with mock.patch('django.contrib.auth.models.User') as user_mock:
        user_mock.objects = mock.MagicMock()
        user_mock.objects.create_user = mock.MagicMock()
        user_mock.objects.create_user.return_value = User()

        kangauser_manager = KangaUserManager()
        kangauser_manager.create(self.username, self.email, self.password, self.last_name, self.first_name, self.request, self.registered, self.send_confirmation)

        self.assertTrue(user_mock.objects.create_user.called)