Python Mock没有断言调用

问题描述

我正在使用模拟库在连接到外部资源并发送命令的程序中修补类.

I'm using the mock library to patch a class in a program that connects to a external resource and sends a dictioanry.

这种结构有点像...

The structure goes a litle like this...

code.py

def make_connection():
    connection = OriginalClass(host, port)
    connection.connect()
    connection.send(param)
    connection.close()

test.py

@mock.path('code.OriginalClass')
def test_connection(self, mocked_conn):
    code.make_connection()
    mocked_conn.assert_called_with(host, port)
    mocked_conn.connect.assert_called_once()
    mocked_conn.send.assert_called_with(param)

第一个assert_Called_with可以正常工作，但是对模拟类的方法的调用不及格.我试过使用patch.object作为装饰器也没有运气.

The first assert_called_with works perfectly, but the calls to method of the mocked classdon't pass. I have tried using patch.object as a decorator also with no luck.

推荐答案

在第一次调用的返回值上调用connect()和send()方法.相应地调整测试:

The connect() and send() methods are called on the return value of the first call; adjust your test accordingly:

mocked_conn.return_value.connect.assert_called_once()
mocked_conn.return_value.send.assert_called_with(param)

我通常首先存储对实例"的引用:

I usually store a reference to the 'instance' first:

@mock.path('code.OriginalClass')
def test_connection(self, mocked_conn):
    code.make_connection()
    mocked_conn.assert_called_with(host, port)
    mocked_instance = mocked_conn.return_value
    mocked_instance.connect.assert_called_once()
    mocked_instance.send.assert_called_with(param)

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