[rspec-users] Problem testing method

Matt Wynne matt at mattwynne.net
Thu Sep 25 07:44:49 EDT 2008

On 25 Sep 2008, at 11:51, Carlos Rafael Belizón Ibáñez wrote:
> And I got this error:
> 4)
> Spec::Mocks::MockExpectationError in 'Alineado.cambiar_por with the  
> game
> in play and sustitutions aviable should decrement in one the
> sustitutions aviables'
> Mock 'Partido_1004' received unexpected message :cambios_visitante=  
> with
> (2)
> /home/carlos/NetBeansProjects/ofs/app/models/alineado.rb:53:in
> `cambiar_por'
> spec/models/alineado_spec.rb:263:
> spec/models/alineado_spec.rb:193:
> And I don't know how fix this error. It's possible test this?
> P.D.: Sorry for my english.
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Have a look at this:

When you call foo -= 1, ruby does two things:

(1) asks foo for its value
(2) tells foo to have a new value, one less than the answer it got  
back from the first question.

If you re-write more verbosely, you'll see what I mean:

foo = foo - 1

Two operations are being done to foo. So if you want to mock out foo,  
you have to mock out both those operations.

Make sense?


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