I am bad at debugging.

ref-test/admin/views.py

@@ -418,7 +418,7 @@ def delete_test():
 @views.route('/tests/close/', methods=['POST'])
 @admin_account_required
 @login_required
-def delete_test():
+def close_test():
     from main import db
     _id = request.get_json()['_id']
     if db.tests.find_one_and_update({'_id': _id}, {'$set': {'expiry_date': datetime.today() - timedelta(days=1) }}):