Matchers to test before, after and around hooks:

describe Post do
  it { should callback(:count_comments).before(:save) }
  it { should callback(:post_to_twitter).after(:create) }
  it { should callback(:evaluate_if_should_validate).before(:validation) }
  it { should callback(:add_some_convenience_accessors).after(:find) }
end

describe User do
  it { should_not callback(:make_email_validation_ready!).before(:validation).on(:update) }
  it { should callback(:make_email_validation_ready!).before(:validation).on(:create) }
  it { should callback(:update_user_count).before(:destroy) }
end

Be aware that this tests for the method call and not the method itself. It makes testing via triggering the callback events (validation, save) unnecessary, but you should still test the called procedure seperately.

In Rails 3 and Bundler, add the following to your Gemfile:

group :test do
  gem "shoulda-callback-matchers"
end

# rspec-rails needs to be in the development group so that Rails generators
# work.
group :development, :test do
  gem "rspec-rails"
end

Shoulda will automatically include matchers into the appropriate example groups.

Credits

This gem is maintained by me, Shoulda is maintained and funded by thoughtbot

License

Shoulda is Copyright © 2006-2012 thoughtbot, inc. Callback Matchers is Copyright © 2012 Beat Richartz It is free software, and may be redistributed under the terms specified in the MIT-LICENSE file.