How to test scopes?

Question

tried to find but with no success. Just wondering how could I test scopes in Rails 3.

Could be using rspec, shoulda or just a test unit.

Thanks.

Actually, I trying this way, but it's not complete test since it's still need to put the order() method.

The Scope:

scope :recents_available, where(:available => true, :locked => false).order("created_at DESC")

describe Job, ":recents_available" do

it "should have the scope" do
  Job.should respond_to(:recents_available)
end

it "should include recents jobs that are available and unlocked" do
  @job = Factory(:job, :available => true, :locked => false  )      
  Job.recents_available.should include(@job)
end

end

Beckerman

Answer 1

David Chelimsky (Rspec's creator) offered up the following example in the Rspec Google Group:

describe User, ".admins" do 
  it "includes users with admin flag" do 
    admin = User.create! :admin => true 
    User.admin.should include(admin) 
  end

  it "excludes users without admin flag" do 
    non_admin = User.create! :admin => false 
    User.admin.should_not include(non_admin) 
  end 
end

class User < ActiveRecord::Base 
  named_scope :admins, :conditions => {:admin => true} 
end 

It's obviously not the same example as yours, but it should give you an idea of how to do it. The relevant thread for context is here: http://groups.google.com/group/rspec/browse_thread/thread/6706c3f2cceef97f

Menticide

Answer 2

I'm sure there's a more elegant solution, but I've always just set up some objects that should and shouldn't be in my scope. After calling the scope, I check that the returned has the object that it should, and doesn't have the object that it shouldn't.

If anything, I hope to be enlightened by other answers.

Arenicolous

setting up two edge cases and testing your method (which is what scope really is) is an elegant test solution, so dont worry about using the above answer – Gitagitel