[rspec-users] Testing render :update

David Chelimsky dchelimsky at gmail.com
Mon Jun 14 22:35:14 EDT 2010


On Jun 14, 2010, at 7:05 PM, David Chelimsky wrote:

> On Jun 14, 2010, at 6:40 PM, Marcelo de Moraes Serpa wrote:
> 
>> Hey guys.
>> 
>> I would like to test the following behavior:
>> 
>>       render :update do |page|
>>            page.replace_html 'errors', :partial => 'signup_errors', :locals => { :errors => 'errors'}
>>          end
>>        }
>> 
>> I'm doing:
>> 
>> controller.should_receive(:render).with(:update)
>> 
>> But I am not sure on how to test the block. Maybe checking out what is the class of the page var and setting up an expection on it?
> 
> Hmmm. The common idiom for this is:
> 
> page = double('page')
> controller.stub(:render).with(:update).and_yield(page)
> page.should_receive(:replace_html).with(...)
> 
> This does not seem to work with rspec-2/rails-3. Don't know why yet (won't be able to look for a bit), but my guess is that something (like rspec :) ) is adding render() to the controller even later than this stub does. I'll follow up if I learn something.

Looks like action_pack calls render twice (the 2nd time in action_controller/metal/implicit_render.rb:10:in `default_render'), so we've got to stub the :render call twice:

page = double('page')
controller.stub(:render)
controller.stub(:render).with(:update).and_yield(page)
page.should_receive(:replace_html).with(...)

Bummer. It seems like this is a rails bug (render should only get called once, and there is code that prevents it from being called twice, but not _all_ of the time), but I'm not sure if I can make that case or not. I'll try :)

Cheers,
David


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