[rspec-users] Can I set an expectation that a method invokes super?

Ashley Moran ashley.moran at patchspace.co.uk
Thu Jan 28 14:14:44 EST 2010

On Jan 28, 2010, at 5:49 pm, Rick DeNatale wrote:

> I'd like to write a spec to ensure that this doesn't regress, but my
> imagination is failing me as to how to do it.
> Any ideas?

Yes: don't use inheritance for implementations.  The bug you describe is arguably a violation of the Liskov Substitution Principle, ie the derived class changed the functionality it inherited in a way that broke the expected behaviour of all derived classes.

If you can write a spec (possibly shared examples) that defines the contract you expect *all* controllers to follow - eg display an error page in this situation - you can run that against all your controllers.  Checking that you call `super` doesn't necessarily give you this security.

If you want to post #rescue_action_in_public there might be another way, depending on your code.  I'm no Rails guru though.

BTW if this sounds like a rant, it is :)  I am constantly stamping my feet over the way controllers in Rails, Merb etc are implemented, as they make writing specs extremely difficult.

Let me know if this is not clear as I've thrown the email together in a hurry before going home for the night...



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