python. monkey patch a celery method so we can test it

test_celery.py

class TestEmailer(unittest.TestCase):
    def setUp(self):
        super(TestEmailer, self).setUp()
        self.applied_tasks = []

        self.original_celery = celery_jobs.post_url.delay

        def new_apply_async(*args):
            self.applied_tasks.append(args)

        # monkey patch my celery job function
        celery_jobs.post_url.delay = new_apply_async

    def tearDown(self):
        super(TestEmailer, self).tearDown()
        # Reset the monkey patch to the original method
        celery_jobs.post_url.delay = self.original_celery