Writing (integration) tests that depend on Celery tasks is problematic. When you manually run a Celery worker together with your tests, it runs in a separate process and there's no clean way to address objects targeted by Celery from your tests. When you use a separate test database (as with Django for example), you'll have to duplicate configuration code so your Celery worker accesses the same database.
celerytest provides the ability to run a Celery worker in the background from your tests. It also allows your tests to monitor the worker and pause until Celery tasks are completed.
To start a Celery worker in a separate thread, use:
app = Celery() # your Celery app
worker = start_celery_worker(app) # configure the app for our celery workerTo wait for the worker to finish executing tasks, use:
result = some_celery_task.delay()
worker.idle.wait() # optionally specify time-outTo use this with your django app through django-celery, get your app as such:
from djcelery.app import app
worker = start_celery_worker(app)If you want to use this in a unittest TestCase, you can use CeleryTestCaseMixin. If you're writing unit tests that depend on a celery worker, though, you're doing it wrong. For unit tests, you'll want to mock your Celery methods and test them separately. You could use CeleryTestCaseMixin to write integration tests with Celery tasks, though.
from unittest import TestCase
from celerytest.testcase import CeleryTestCaseMixin, setup_celery_worker
import time
app = Celery()
setup_celery_worker(app) # need to setup worker outside
class SomeTestCase(CeleryTestCaseMixin, TestCase):
celery_app = app
celery_concurrency = 4
def test_something(self):
result = multiply.delay(2,3)
self.worker.idle.wait()
self.assertEqual(result.get(), 6)To automatically launch a worker in the background while running a Lettuce integration test suite, add to terrain.py:
# my_celery_app.py
app = Celery('my_celery_app', broker='amqp://')
# terrain.py
from lettuce import *
from celerytest import start_celery_worker
# replace this with an import of your actual app
from my_celery_app import app
@before.harvest
def initial_setup(server):
# memory transport may not work here
world.celery = start_celery_worker(app, config="amqp")
@after.harvest
def cleanup(server):
world.celery.stop()
@after.each_step
def after_step(step):
# make sure we've received any scheduled tasks
world.celery.active.wait(.05)
# allow tasks to complete
world.celery.idle.wait(5)Install the latest version of celerytest from PyPI:
$ pip install celerytest
Or, clone the latest version of celerytest from GitHub and run setup:
$ git clone git://github.com/RentMethod/celerytest.git
$ cd celerytest
$ ./setup.py install # as root
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