[rspec-users] Stub a call that happens inside a block

[David Chelimsky]

On Sun, Nov 15, 2009 at 7:50 PM, Marcelo de Moraes Serpa <
celoserpa at gmail.com> wrote:

> Hello list,
>
> I had a hard time to find out a way to mock the singleton feed method of
> the following class:
> class RssReader
>
>   def self.feed(feed_url)
>     output = []
>     open(feed_url) do |http|
>       response = http.read
>       result = RSS::Parser.parse(response, false)
>       result.items.each_with_index do |item, i|
>         output << {:title => item.title, :description => item.description,
> :pubDate => item.pubDate, :link => item.link}
>       end unless result.nil?
>     end
>     output
>   end
> end
>
>
Try this:

describe "..." do
  it "..." do
    http = mock('http')
    RssReader.should_receive(:open).with('http://this.url')and_yield(http)
    http.should_receive(:read) ....
    ...
    RssReader.feed('http://this.url')
  end
end

Make sense?

David


> Since it is being passed a block, I could not intercept the code inside the
> block, the specific code I'd like to stub is the http.read. I have tried to
> do:
>
> Http.should_receive(:read).and_return(xml) #xml being a fixture, loaded
> from a file.
>
> However, the stub is not applied.
>
> Any ideas on how this could be solved? The only way I could think is to
> avoid using the block...
>
> Thanks,
>
> Marcelo.
>
>
>
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