[rspec-users] setting partial stub for just one value and letting obj handle the rest

Matt Wynne matt at mattwynne.net
Thu Apr 1 16:45:36 EDT 2010

On 1 Apr 2010, at 21:35, David Chelimsky wrote:

> On Apr 1, 2010, at 3:14 PM, drewB wrote:
>> Occasionally, I find myself in a situation where I want to have a  
>> mock
>> obj returned if a method is called with a particular argument but
>> handled normally otherwise.  For example, lets say I have a Model
>> named User and I am specing a controller that sends messages from one
>> user to another.  When User.find is called for the user who is making
>> the request I want it to run normally but when User.find is called  
>> for
>> the receiver I want it to return a mocked obj.  In this case, I can  
>> do
>> something like (http://gist.github.com/352305):
>> user = mock_model(User)
>> User.stub!(:find).at_least(1).and_return do |id|
>>   if id == mock_user.id.to_s
>>     user
>>   else
>>     User.find_by_id(id)
>>   end
>> end
>> If I didn't have another method that allowed me to find a User by  
>> it's
>> id this won't work.
>> Is there an easier way to accomplish this?
> Not really. When you stub a method, the framework overrides that  
> method with its own implementation. There's no mechanism in place to  
> say "pass the message onto the real object if it doesn't have the  
> arguments I'm interested in." I'm not sure of any framework that  
> does that. Maybe RR, but I'm not sure.
> Good luck.
> David

I can't help but chime in here that I would be pretty irritated to  
come across a test that mixed up using mocks and real objects,  
especially when they're the same class. Can you not use a mock for the  
other instance of User too?

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