diff --git a/swh/scheduler/tests/celery_testing.py b/swh/scheduler/tests/celery_testing.py
--- a/swh/scheduler/tests/celery_testing.py
+++ b/swh/scheduler/tests/celery_testing.py
@@ -5,6 +5,10 @@
 
 
 CELERY_BROKER_PROTOCOLS = ['amqp', 'redis', 'sqs']
+CELERY_RESULT_BACKENDS = {
+    'amqp': lambda broker_url: 'rpc://',
+    'redis': lambda broker_url: broker_url,
+    }
 
 
 def setup_celery():
@@ -22,6 +26,10 @@
                 break
     if broker_url:
         current_app.conf.broker_url = broker_url
+        scheme = urllib.parse.splittype(broker_url)[0]
+        backend = CELERY_RESULT_BACKENDS.get(scheme)
+        if backend:
+            current_app.conf.result_backend = backend(broker_url)
 
 
 class CeleryTestFixture: