Stub a call that happens inside a block

Testing RSpec
1

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

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.

2

On Sun, Nov 15, 2009 at 7:50 PM, Marcelo de Moraes S. <
[email protected]> wrote:

  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

3

Yeah, thanks David :slight_smile:

4

Yes, thanks, David!