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Asked: 2026-05-11T09:49:23+00:00

I want to be able to spec out that when Open-Uri open() calls either

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I want to be able to spec out that when Open-Uri open() calls either timeout or raise an exception such as SocketError I am handling things as expected, however I’m having trouble with this.

Here is my spec (for SocketError):

@obj.should_receive(:open).with('some_url').and_raise(SocketError)

And the part of my object where I’m using open-uri:

begin   resp = open(url)   resp = resp.read rescue SocketError   something = true end

However in this situation the spec fails as with a nil.read error.

This is the second time this week I’ve come across this problem, the previous time I was attempting to simulate a TimeoutError when wrapping open() with a timeout() {}, that time I gave up and just caused an actual timeout to happen by opening up the class. I could obviously cause this to throw a SocketError by trying to call an invalid URL, but I’m sure there is a correct way to mock this out with RSpec.

Update: I obviously wasn’t thinking clearly that late at night, the error was actually when I re-tried the URL after the SocketError, the and_raise(SocketError) part worked fine.

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1 Answer

  1. The line you provided should work, based on the information you’ve given: I made a tiny test class and spec (see below) with only the described functionality, and things behaved as expected. It might be helpful if you could provide a little more context – the full ‘it’ block from the spec, for instance, might expose some other problem.

    As mentioned, the following spec passes, and I believe it captures the logic you were attempting to verify: 

    require 'rubygems' require 'spec'  class Foo   attr_accessor :socket_error    def get(url)     @socket_error = false     begin       resp = open(url)       resp = resp.read     rescue SocketError       @socket_error = true     end   end end  describe Foo do   before do     @foo = Foo.new   end    it 'should handle socket errors' do     @foo.should_receive(:open).with('http://www.google.com').and_raise(SocketError)     @foo.get('http://www.google.com')     @foo.socket_error.should be_true   end end
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