Question

考虑以下代码进行测试：

import pika

class MQ_Client():
    connection = None
    channel = None
    exchange_name="my_exchange"

    def connect(self):
        self.connection = pika.BlockingConnection(pika.ConnectionParameters(host="mq_server")

    def publish(self, message):

        properties = pika.BasicProperties(content_type='text/json', delivery_mode=1)

        if self.channel.basic_publish(exchange=self.exchange_name, routing_key='', properties=properties, body=message):
            log.info("Successfully published this message to exchange \"" + self.exchange_name + "\": " + message)
        else:
            log.error("Failed to publish message \"" + message + "\" to the exchange \"" + self.exchange_name + "\"!")
            raise Exception("Failed to publish message to the queue.")

我想修补Pika的basic_publish方法来引发异常，并可以使用一些帮助来弄清楚如何做到这一点。这是我最后一次尝试：

@mock.patch.object(pika.BlockingConnection, 'channel')
def test_that_mq_publish_problems_return_error(self, mocked_channel):
    with self.client as client:

        mocked_channel.basic_publish.side_effect = Exception()

        response = client.put("/api/users/bob", json="somedata")
        self.assertEqual(response.status_code, 500)

任何有关如何实现此工作的建议将不胜感激！

Answer 1

我知道了。模拟实例方法与模拟类方法完全不同。读完this excellent article之后，我终于了解了如何执行此操作，结果证明，修补basic_publish方法所需要做的就是稍微修改一下我的测试，如下所示：

@mock.patch('mq_client.pika.BlockingConnection', spec=pika.BlockingConnection)
def test_that_mq_publish_problems_return_error(self, mocked_connection):
    with self.client as client:
       mocked_connection.return_value.channel.return_value.basic_publish.return_value = False

Python模拟：修补Python Pika的“ basic_publish”函数

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