[rspec-users] Could not find shared example group named "an admin is logged in"

David Chelimsky dchelimsky at gmail.com
Thu Oct 7 21:25:59 EDT 2010


On Oct 7, 2010, at 4:36 PM, Tim Gremore wrote:

> I'm stuck! Not sure what I'm missing but I'm struggling to get a shared example group working with my controller specs.  Here is a piece of the backtrace:
> 
> /Users/20217633/.rvm/gems/ruby-1.9.2-p0 at rails3/gems/rspec-core-2.0.0.rc/lib/rspec/core/example_group.rb:68:in `it_should_behave_like': Could not find shared example group named "an admin is logged in" (RuntimeError)
> 	from /Users/20217633/apps/curriculum/spec/controllers/users_controller_spec.rb:5:in `block in <top (required)>'
> 	from /Users/20217633/.rvm/gems/ruby-1.9.2-p0 at rails3/gems/rspec-core-2.0.0.rc/lib/rspec/core/example_group.rb:132:in `module_eval'
> 	from /Users/20217633/.rvm/gems/ruby-1.9.2-p0 at rails3/gems/rspec-core-2.0.0.rc/lib/rspec/core/example_group.rb:132:in `subclass'
> 	from /Users/20217633/.rvm/gems/ruby-1.9.2-p0 at rails3/gems/rspec-core-2.0.0.rc/lib/rspec/core/example_group.rb:119:in `describe'
> 	from /Users/20217633/.rvm/gems/ruby-1.9.2-p0 at rails3/gems/rspec-core-2.0.0.rc/lib/rspec/core/extensions/object.rb:7:in `describe'
> 	from /Users/20217633/apps/curriculum/spec/controllers/users_controller_spec.rb:3:in `<top (required)>'
> 
> I'm using the following:
> 
> rails 3.0
> rspec-rails 2.0.0.rc (and friends)
> cucumber-rails 0.3.2
> factory_girl_rails 1.0
> 
> And the following for shared examples:
> 
> module ExampleGroupMethods
> 
>   describe "an admin is logged in", :shared => true do
>     before(:each) do
>       controller.stubs(:logged_in? => true)
>       controller.stubs(:current_user => Factory.create(:admin))
>     end
>   end
> 
>   describe "a supporter is logged in", :shared => true do
>     before(:each) do
>       controller.stubs(:logged_in? => true)
>       controller.stubs(:current_user => Factory.create(:supporter))
>     end
>   end
> 
>   describe "a manager is logged in", :shared => true do
>     before(:each) do
>       controller.stubs(:logged_in? => true)
>       controller.stubs(:current_user => Factory.create(:manager))
>     end
>   end
>   
> end
> 
> And the follow controller spec:
> 
> describe UsersController do
>   
>   it_should_behave_like "an admin is logged in"
>   
>   describe "handling /users" do
> 
>     before do
>       @user = mock_model(User)
>     end
>     
>     def do_get
>       get :index
>     end
>     
>     it "should assign users to the view" do
>       User.should_receive(:all).with(:order => "last_name, first_name").and_return([ @user ])
>       do_get
>     end
>     
>   end
> 
> end
> 
> And finally this spec_helper:
> 
> # This file is copied to spec/ when you run 'rails generate rspec:install'
> ENV["RAILS_ENV"] ||= 'test'
> require File.expand_path("../../config/environment", __FILE__)
> require 'rspec/rails'
> 
> # Requires supporting ruby files with custom matchers and macros, etc,
> # in spec/support/ and its subdirectories.
> Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}
> 
> RSpec.configure do |config|
>   # == Mock Framework
>   #
>   # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
>   #
>   # config.mock_with :mocha
>   # config.mock_with :flexmock
>   # config.mock_with :rr
>   config.mock_with :rspec
> 
>   # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
>   # config.fixture_path = "#{::Rails.root}/spec/fixtures"
> 
>   # If you're not using ActiveRecord, or you'd prefer not to run each of your
>   # examples within a transaction, remove the following line or assign false
>   # instead of true.
>   config.use_transactional_fixtures = true
>   
>   # see http://asciicasts.com/episodes/157-rspec-matchers-macros
>   config.include(ControllerMacros, :type => :controller)
>   
>   # see http://pastie.org/870928
>   config.include(ExampleGroupMethods, :type => :controller)
> end
> 
> Anyone have a suggestion?  Thanks in advance

Shared examples have changed significantly in rspec-2. See http://github.com/rspec/rspec-core/blob/master/features/example_groups/shared_example_group.feature to get a feel for how they work now.

The first thing is that :shared = true no longer works. You need to use shared_examples_for. The other big change is that it_should_behave_like creates a nested group, so if you do this:

shared_examples_for "foo" do
  it "does something" do
  end
end

describe "something" do
  it_behaves_like "foo" # it_behaves_like is an alias for it_should_behave_like
end

That's the same as doing this:

describe "something" do
  context "behaves like foo" do
    it "does something" do
    end
  end
end

This is a good thing, because it prevents the context of the shared group from polluting the including group's scope, which can lead (and has led) to a lot of confusion.

Now in your case, you're using the shared group as a means of sharing before blocks. While that works, it's the opposite of the intent of shared groups, which is that the enclosing group should provide the context for the shared group. What you _can_ do, however, to maintain the structure you have, is to pass a block to it_should_behave_like, so your example change from this:

# rspec-1
describe UsersController do
  it_should_behave_like "an admin is logged in"
  describe "handling /users" do
    before do
      @user = mock_model(User)
    end
    
    def do_get
      get :index
    end
    
    it "should assign users to the view" do
      User.should_receive(:all).with(:order => "last_name, first_name").and_return([ @user ])
      do_get
    end
  end
end

to this:

#rspec-2
describe UsersController do
  it_should_behave_like "an admin is logged in" do
    describe "handling /users" do
      before do
        @user = mock_model(User)
      end
      
      def do_get
        get :index
      end
      
      it "should assign users to the view" do
        User.should_receive(:all).with(:order => "last_name, first_name").and_return([ @user ])
        do_get
      end
    end
  end
end

HTH,
David
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