Testing Django email backend

Question

In my settings.py, I put:

EMAIL_BACKEND = 'mailer.backend.DbBackend'

So even when importing from from django.core.mail import send_mail, the send_mail function still queues up the email in the database instead of sending it immediately.

It works just fine when actually running the website, but when testing the website, and accessing some webpages that trigger emails, emails are no longer queued anymore:

def test_something(self):
    ...
    # Check no emails are actually sent yet
    self.assertEquals(len(mail.outbox), 0) # test fails here -- 2 != 0

    # Check queued emails.
    messages = Message.objects.all()
    self.assertEquals(messages.count(), 2) # test would also fail here -- 0 != 2
    ...

How come it doesn't seem to be using the backend when it is testing? (importing send_mail from mailer itself gets the tests to pass, but I can't really change the imports of other mailing apps like django-templated-email)

Answer 1

According to this question django overrides the setting.EMAIL_BACKEND when testing to 'django.core.mail.backends.locmem.EmailBackend'. It's also in the django docs here.