diff --git a/README.md b/README.md
index 3673eaf..01a2c41 100644
--- a/README.md
+++ b/README.md
@@ -1,51 +1,45 @@
 swh-scheduler
 =============
 
 Job scheduler for the Software Heritage project.
 
 Task manager for asynchronous/delayed tasks, used for both recurrent (e.g.,
 listing a forge, loading new stuff from a Git repository) and one-off
 activities (e.g., loading a specific version of a source package).
 
 
 # Tests
 
 ## Running test manually
 
 ### Test data
 
 To be able to run (unit) tests, you need to have the
 [[https://forge.softwareheritage.org/source/swh-storage-testdata.git|swh-storage-testdata]]
 in the parent directory. If you have set your environment following the
 [[ https://docs.softwareheritage.org/devel/getting-started.html#getting-started|Getting started]]
 document everythong should be set up just fine.
 
 Otherwise:
 
 ```
 ~/.../swh-scheduler$ git clone https://forge.softwareheritage.org/source/swh-storage-testdata.git ../swh-storage-testdata
 ```
 
 ### Required services
 
-Unit tests may require a running celery broker on your system (rabbitmq by
-default). You can set the `BROKER_URL` environment variable to specify the url
-to be used.
-
-If you do not want to use your system's broker (or do not want to have one
-running), you shold use [[ https://github.com/jd/pifpaf | pifpaf ]] to take
-care of that for you.
-
+Unit tests that require a running celery broker uses an in memory broker/result
+backend by default, but you can choose to use a true broker by setting
+`CELERY_BROKER_URL` and `CELERY_RESULT_BACKEND` environment variables up.
 
 For example:
 
 ```
-$ pifpaf --env-prefix PG run postgresql -- \
-  pifpaf --env-prefix AMQP run rabbitmq nosetests
+$ CELERY_BROKER_URL=amqp://localhost pifpaf run postgresql nosetests
 
 .....................................
 ----------------------------------------------------------------------
 Ran 37 tests in 15.578s
 
 OK
 ```
diff --git a/swh/scheduler/tests/celery_testing.py b/swh/scheduler/tests/celery_testing.py
index 5f0ab61..2859e9c 100644
--- a/swh/scheduler/tests/celery_testing.py
+++ b/swh/scheduler/tests/celery_testing.py
@@ -1,37 +1,18 @@
 import os
-import urllib
-
-from celery import current_app
-
-
-CELERY_BROKER_PROTOCOLS = ['amqp', 'redis', 'sqs']
 
 
 def setup_celery():
-    broker_url = None
-    if 'BROKER_URL' in os.environ:
-        broker_url = os.environ['BROKER_URL']
-
-    elif 'PIFPAF_URLS' in os.environ:
-        urls = os.environ['PIFPAF_URLS'].split(';')
-        urls = [x.replace('rabbit://', 'amqp://') for x in urls]
-        for url in urls:
-            scheme = urllib.parse.splittype(url)[0]
-            if scheme in CELERY_BROKER_PROTOCOLS:
-                broker_url = url
-                break
-    if broker_url:
-        current_app.conf.broker_url = broker_url
+    os.environ.setdefault('CELERY_BROKER_URL', 'memory://')
+    os.environ.setdefault('CELERY_RESULT_BACKEND', 'cache+memory://')
 
 
 class CeleryTestFixture:
-    """Mix this in a test subject class to get Celery testing support configured
-    via environment variables, typically set up by pifpaf.
+    """Mix this in a test subject class to setup Celery config for testing
+    purpose.
 
-    It expect a connection url to a celery broker either as a BROKER_URL or a
-    url listed in a PIFPAF_URL environment variable.
+    Can be overriden by CELERY_BROKER_URL and CELERY_RESULT_BACKEND env vars.
     """
 
     def setUp(sel):
         setup_celery()
         super().setUp()