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--- a/Allura/allura/tests/unit/factories.py
+++ b/Allura/allura/tests/unit/factories.py
@@ -37,7 +37,7 @@
         project_id=project._id,
         tool_name='myapp',
         options={'mount_point': 'my_mounted_app'},
-        acl={})
+        acl=[])
 
 
 @flush_on_return