Add unit tests for our mail API

src/tests/base/test_mail.py

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+from django.conf import settings
+from django.utils.timezone import now
+from django.core import mail as djmail
+from django.utils.translation import ugettext_lazy as _
+import pytest
+
+from pretix.base.models import Event, Organizer, User
+from pretix.base.services.mail import mail
+
+
+@pytest.fixture
+def env():
+    o = Organizer.objects.create(name='Dummy', slug='dummy')
+    event = Event.objects.create(
+        organizer=o, name='Dummy', slug='dummy',
+        date_from=now(), plugins='pretix.plugins.banktransfer'
+    )
+    user = User.objects.create_user('dummy@dummy.dummy', 'dummy@dummy.dummy', 'dummy')
+    user.email = 'dummy@dummy.dummy'
+    user.save()
+    return event, user, o
+
+
+@pytest.mark.django_db
+def test_send_mail_with_event_sender(client, env):
+    djmail.outbox = []
+    event, user, organizer = env
+    event.settings.set('mail_from', 'foo@bar')
+    mail(user, 'Test subject',
+         'mailtest.txt', {}, event)
+
+    assert len(djmail.outbox) == 1
+    assert djmail.outbox[0].to == [user.email]
+    assert djmail.outbox[0].subject == 'Test subject'
+    assert djmail.outbox[0].from_email == 'foo@bar'
+
+
+@pytest.mark.django_db
+def test_send_mail_with_default_sender(client, env):
+    djmail.outbox = []
+    event, user, organizer = env
+    mail(user, 'Test subject',
+         'mailtest.txt', {}, event)
+    del event.settings['mail_from']
+
+    assert len(djmail.outbox) == 1
+    assert djmail.outbox[0].to == [user.email]
+    assert djmail.outbox[0].subject == 'Test subject'
+    assert djmail.outbox[0].from_email == settings.MAIL_FROM
+
+
+@pytest.mark.django_db
+def test_send_mail_with_user_locale(client, env):
+    djmail.outbox = []
+    event, user, organizer = env
+    user.locale = 'de'
+    user.save()
+    mail(user, _('User'),
+         'mailtest.txt', {}, event)
+    del event.settings['mail_from']
+
+    assert len(djmail.outbox) == 1
+    assert djmail.outbox[0].subject == 'Benutzer'
+    assert 'The language code used for rendering this e-mail is de.' in djmail.outbox[0].body