my_test.py

    @patch('intake.management.commands.send_unopened_apps_notification.notifications')
    @patch('intake.management.commands.send_unopened_apps_notification.models')
    @patch('intake.management.commands.send_unopened_apps_notification.settings')
    def test_send_unopened_apps_notification(self, settings, models, notifications):

        models.FormSubmission.get_unopened_apps.return_value = [
            Mock(id=1), Mock(id=2)
            ]
        settings.DEFAULT_NOTIFICATION_EMAIL = "[email protected]"

        send = Mock()
        notifications.front_email_daily_app_bundle.send = send
        
        from intake.management.commands.send_unopened_apps_notification import Command
        # instantiate
        # this step makes me nervous,
        # because I don't what other things that Django
        # touches during __init__ unless I go read the method
        command = Command()
        # patch the inherited methods that I didn't write
        command.style = Mock()
        command.stdout = Mock()
        # run the unit
        command.handle()

        send.assert_called_once_with(
            to="[email protected]",
            count=2,
            submission_ids=[1,2])

send_unopened_apps_notification.py

from django.core.management.base import BaseCommand

from django.conf import settings

from intake import notifications, models


class Command(BaseCommand):
    help = 'Sends an email about unopened applications'

    def handle(self, *args, **options):
        email = settings.DEFAULT_NOTIFICATION_EMAIL
        unopened_submissions = models.FormSubmission.get_unopened_apps()
        count = len(unopened_submissions)
        notifications.front_email_daily_app_bundle.send(
            to=email,
            count=count,
            submission_ids=[s.id for s in unopened_submissions]
            )
        self.stdout.write(
            self.style.SUCCESS(
                "Email {} with a link to {} unopened applications".format(
                    email, count)
                )
            )

The main concern I have with this method is that in Django generally, I don't know what other things are affected or accessed by any given inherited __init__ method.