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Re: mock django cache

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----- Original Message -----
> In my settings.py , I have specified my cache as :
> CACHES = {
>     'default': {
>         ......
>     }
> }
> 
> In my views.py, I have
> 
> import requests
> from django.core.cache import cache, get_cache
> 
> def aview():
>     #check cache
>     if not get_cache('default').get('key'):
>         #make request and save in cache
>         result = request.get('some_url')
>         get_cache('default').set('key', result)
>         return result
>     else:
>         return get_cache('default').get('key')
> 
> 
> Now in my tests.py, I have been able to mock requests.get('aurl'), so
> that makes sure that no external requests are made.
> 
> But the test code still hits the cache and gets/sets from it. So if
> my prod has already set the cache, then test is failing because it
> gets the data from same cache. Or if I run my tests first, then the
> test case is setting the cache with test data and I see that same
> reflected when I run prod website.
> 
> How can I mock the calls to get_cache('default').set('key', result)
> and get_cache('default').get('key') so that the set call does not
> sets the real cache ( return None?) and get does not return anything
> in actual cache.
> 
> Please provide me with code sample to how to get this done.
> 
> Here is how I have mocked my requests.get
> 
>     def test_get_aview(self):
>         with mock.patch('requests.get') as mymock:
>             mymock.side_effect = (lambda url: MOCKED_DATA[url])
> 
> What code can I put after this to make it work? I tried something
> like
> 
> 
> class MockCacheValue(mock.MagicMock):
>     def get(self, key):
>         print 'here'
>         return None
>     def set(self, key, value):
>         print 'here 2'
>         pass
> 
> def test_get_aview(self):
>         with mock.patch('requests.get') as mymock:
>             mymock.side_effect = (lambda url: MOCKED_DATA[url])
>             mock.patch('django.core.cache.get_cache',
>             new=MockCacheValue)
> 
> but it does not work and putting a print statement inside get/set
> above does not print anything giving me an idea that its not mocked
> properly


Having a quick look at django doc, get_cache() returns a cache which has get set methods, so you need get_cache to return a Mock object that mock the get and set method.

Try something like :

mock.patch('django.core.cache.get_cache',Mock(return_value=MockCacheValue())

JM


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Re: mock django cache Jean-Michel Pichavant <jeanmichel@sequans.com> - 2013-04-08 10:56 +0200

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