为什么Django测试通过？

问题描述

单独调用send_mail函数将导致由于主题中的换行符引起的BadHeaderError异常。

Calling the send_mail function independently will cause a BadHeaderError exception due to the newline in the subject.

我预计这个test_newline_causes_exception也会失败，但是没有。这是在Django 1.3中。任何想法？

I expect this test_newline_causes_exception to fail as well, but it does not. This is in Django 1.3. Any ideas?

from django.core.mail import send_mail
from django.utils import unittest

class EmailTestCase(unittest.TestCase):

    def test_newline_causes_exception(self):
        send_mail('Header\nInjection', 'Here is the message.', '[email protected]',
                  ['[email protected]'], fail_silently=False)

编辑：此新测试显示，在测试中使用send_mail时，不会调用头文件检查代码（django.core.mail.message.forbid_multi_line_headers）。

This new test shows that the header checking code (django.core.mail.message.forbid_multi_line_headers) is not called when send_mail is used in tests.

from django.core.mail import send_mail, BadHeaderError, outbox
from django.utils import unittest

class EmailTestCase(unittest.TestCase):

    def test_newline_in_subject_should_raise_exception(self):

        try:
            send_mail('Subject\nhere', 'Here is the message.',
                      '[email protected]', ['[email protected]'], fail_silently=False)
        except BadHeaderError:
            raise Exception

        self.assertEqual(len(outbox), 1)

        self.assertEqual(outbox[0].subject, 'Subject here')

结果：

AssertionError: 'Subject\nhere' != 'Subject here'

推荐答案

我发现Django 1.5中已经解决了这个问题。测试电子邮件后端（locmem.py）现在执行与标准后端相同的头清理。

I found that this issue has been fixed in Django 1.5. The testing email backend (locmem.py) now performs the same header sanitization as the standard backends.

编辑

我发现在Django版本

I found a workaround for testing header validation in Django versions <1.5.

使用get_connection方法加载与生产后端执行相同验证的控制台后端。

Use the get_connection method to load the console backend which performs the same validations as the production backend.

感谢Alexander Afanasiev指出我的方向正确。

Thanks to Alexander Afanasiev for pointing me in the right direction.

connection = get_connection('django.core.mail.backends.console.EmailBackend')
send_mail('Subject\nhere',
          'Here is the message.',
          '[email protected]',
          ['[email protected]'],
          fail_silently=False,
          connection=connection)

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