难以嘲笑类使用python“模拟”（Django）

Question

我使用python的“模拟”模块来模拟django项目中的类和函数。 我的项目的结构是：

Project name --> 'hello' 
       App1 ----> hello 
       App2 ----> hello_world 
       App3 ----> bye 

'你好' 只包含tests.py和settings.py。 '程序hello_world' 包含查看文件'greetings.py'认为是这样的：

from django.shortcuts import render 
from django.http import HttpRequest,HttpResponse 
from bye import views 

# Create your views here.                                             

def greet(request): 
    views.saybye() 
    gb_class = views.goodbye() 

    print gb_class.saygoodbye() 
    print 'greet called' 

    return HttpResponse('hello world',content_type='application/html') 

'再见' 包含 'views.py' 包含：

from django.shortcuts import render 
from django.http import HttpRequest 

# Create your views here. 

def saybye(): 
    print "goodbye world" 
    return 

class goodbye: 
    def __init__(self): 
     print "goodbye's init called" 
     return 

    def saygoodbye(self): 
     return "goodbye.saygoodbye called" 

现在，我的'tests.py' 是：

from unittest import TestCase 

import mock 
from mock import patch 

from hello_world import greetings 
import bye 

from django.test.client import RequestFactory 


class TestBasic(TestCase): 
    def setUp(self): 
     self.var = 'abc' 
     self.factory = RequestFactory() 

    @patch('bye.views.goodbye') 
    def test_greeting(self,mocksaybye): 
     assert mocksaybye is bye.views.goodbye 
     mocksaybye.saygoodbye = mock.MagicMock(return_value="mocked goodbye called") 

     bye.views.goodbye() 
     print mocksaybye.saygoodbye() 

     assert mocksaybye.called 
     assert mocksaybye.saygoodbye.called 

     req = self.factory.get('/sayhello/') 
     greetings.greet(req) 

我得到上运行 '蟒蛇manage.py测试' 的输出如下：

mocked goodbye called 
goodbye world 
<MagicMock name='goodbye().saygoodbye()' id='60566864'> 
greet called 

我的预期输出的第3行是："mocked goodbye called"从我的理解中，mocksaybye类会嘲笑再见类的saygoodbye功能和返回自定义输出嘲笑再见叫。

但是，这不会发生。为什么这样？另外，我应该怎么做才能得到这个期望的输出？

Answer 1

您需要使用side_effect方法，而不是return_value。而且还@patch.object代替@patch

因此，不是这样的代码：

@patch('bye.views.goodbye') 
def test_greeting(self,mocksaybye): 
    # ... 
    mocksaybye.saygoodbye = mock.MagicMock(return_value="mocked goodbye called") 
    # ... 

使用此（未测试）：

@patch.object('bye.views.goodbye', 'saygoodbye') 
def test_greeting(self,mocksaybye): 
    # ... 
    mocksaybye.side_effect = lambda: "mocked goodbye called" 
    # ...