Fixes failing tests

t/unit/backends/test_couchdb.py

@@ -72,7 +72,7 @@ class test_CouchBackend:
 
     def test_backend_by_url(self, url='couchdb://myhost/mycoolcontainer'):
         from celery.backends.couchdb import CouchBackend
-        backend, url_ = backends.by_url(url)
+        backend, url_ = backends.by_url(url, self.app.loader)
         assert backend is CouchBackend
         assert url_ == url
 

t/unit/backends/test_elasticsearch.py

@@ -68,7 +68,7 @@ class test_ElasticsearchBackend:
         )
 
     def test_backend_by_url(self, url='elasticsearch://localhost:9200/index'):
-        backend, url_ = backends.by_url(url)
+        backend, url_ = backends.by_url(url, self.app.loader)
 
         assert backend is ElasticsearchBackend
         assert url_ == url

t/unit/backends/test_riak.py

@@ -90,7 +90,7 @@ class test_RiakBackend:
     def test_backend_by_url(self, url='riak://myhost/mycoolbucket'):
         from celery.app import backends
         from celery.backends.riak import RiakBackend
-        backend, url_ = backends.by_url(url)
+        backend, url_ = backends.by_url(url, self.app.loader)
         assert backend is RiakBackend
         assert url_ == url