Fix submission tests

server/models.py

@@ -167,7 +167,7 @@ def active_user_ids(self, user_id):
         else:
             return {member.user_id for member in members}
 
-    def backups(self, user_ids, submit):
+    def backups(self, user_ids, submit=False):
         """Return a query for the backups that the list of users has for this
         assignment.
         """
@@ -177,6 +177,9 @@ def backups(self, user_ids, submit):
             Backup.submit == submit
         ).order_by(Backup.client_time.desc())
 
+    def submissions(self, user_ids):
+        return self.backups(user_ids, submit=True)
+
     def final_submission(self, user_ids):
         """Return a final submission for a user, or None."""
         return Backup.query.filter(