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Typhoeus is a great frontend to Curl/Curl::Multi. However, if you have a large spec suite that hits a number of external HTTP resources, you will quickly find yourself getting tired of caching all those resources by hand! Trust me. No seriously, I hate doing this by hand.

Thanks to Paul Dix for writing Typhoeus!


In any specs that hit HTTP via Typhoeus::Hydra, wrap them in a typhoeus_spec_cache block:

describe "making 30 expensive HTTP calls" do
  typhoeus_spec_cache("spec/cache/mycache") do |hydra|
    it "should get 10 URLs" do
      result = fetch_urls(10)
      result.should have(10).things

    it "should get 20 URLs" do
      result = fetch_urls(20)
      result.should have(20).things

Create the cache directory:

mkdir -p spec/cache/mycache

On the first run of these two specs, Typhoeus will make 30 live HTTP requests. These will then be dumped out to .cache files in spec/cache/mycache, and used on subsequent runs, avoiding any future HTTP calls.

Auto-stubbing of Hydra

Calling typhoeus_spec_cache automatically stubs out calls to Typhoeus::Hydra#new with a single shared Hydra object.

Auto-managing of cache files

If the URLs your code hits ever changes, the typhoeus_spec_cache wrapper is smart about handling your cache. It will:

  • Only download new URLs it hasn't seen.
  • Remove any .cache files that aren't needed anymore.

This way, your cache directory will contain exactly the .cache files you need, and no more.


sudo gem install typhoeus_spec_cache

Then, add the following to your spec/spec_helper.rb

require 'typhoeus_spec_cache'

And add these two lines to your Spec::Runner.configure block in spec/spec_helper.rb:

Spec::Runner.configure do |config|

Note on Patches/Pull Requests

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.


Copyright (c) 2010 David Balatero. See LICENSE for details.

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