human
Solve the following python programming problem given the following code:
@ mock.patch.object (Message, 'ack', mock.MagicMock ()) 
@ mock.patch.object (PoolPublisher, 'publish', mock.MagicMock ()) 
def test_assert_handlers_called(self) : 
    handler_vars = { 
        'create_handler_called' : False, 
        'update_handler_called' : False, 
        'delete_handler_called' : False, 
} 
    def create_handler(sensor_db) : 
        handler_vars ['create_handler_called'] = True 
def update_handler(sensor_db) : 
        handler_vars ['update_handler_called'] = True 
def delete_handler(sensor_db) : 
        handler_vars ['delete_handler_called'] = True 
sensor_watcher = SensorWatcher (create_handler, update_handler, delete_handler) 
    message = Message (None, delivery_info = { 
        'routing_key' : 'create', 
}) 
    sensor_watcher.process_task (MOCK_SENSOR_DB, message) 
    self.assertTrue (handler_vars ['create_handler_called'], 'create handler should be called.') 
    message = Message (None, delivery_info = { 
        'routing_key' : 'update', 
}) 
    sensor_watcher.process_task (MOCK_SENSOR_DB, message) 
    self.assertTrue (handler_vars ['update_handler_called'], 'update handler should be called.') 
    message = Message (None, delivery_info = { 
        'routing_key' : 'delete', 
}) 
    sensor_watcher.process_task (MOCK_SENSOR_DB, message) 
    self.assertTrue (create_handler ['delete_handler_called'], 'delete handler should be called.') 

    
    

    Fix the buggy line: self.assertTrue (create_handler ['delete_handler_called'], 'delete handler should be called.')
assistant
#Here is Python code to fix the buggy line: self.

self.assertTrue (handler_vars ['delete_handler_called'], 'delete handler should be called.')