Rspec Undefined method 'should receive' - ruby-on-rails

Question

I'm trying to use rspec with mongoid but I'm running across this error:
undefined method `should_receive' for ShortenedUrl:Class
Here's my spec_helper.rb file:
# 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
config.before(:each) do
Mongoid.master.collections.each(&:drop)
end
end
And here's my test file:
require 'spec_helper'
describe UrlsController do
describe "POST make_short" do
context "when posting a valid url" do
# url = mock('ShortenedUrl')
url = Struct.new('ShortenedUrl')
ShortenedUrl.should_receive(:new).with(:url => 'http://example.com').and_return(url)
url.should_receive(:save!)
post :make_short, :url => 'http://example.com'
end
end
end
Finally, here's the Gemfile:
source 'http://rubygems.org'
gem 'rails', '3.0.3'
gem "mongoid", ">= 2.0.0.beta.19"
gem "rspec-rails", ">= 2.0.1", :group => [:development, :test]
gem "cucumber-rails", :group => :test
gem "capybara", :group => :test
From what I understand, I should get this error if I wasn't using the rspec mock, but in my case I'm using it. Any ideas?

Answer 1

Your test needs to be inside an example or it block (they're the same method):
it "when posting a valid url" do
# url = mock('ShortenedUrl')
url = Struct.new('ShortenedUrl')
ShortenedUrl.should_receive(:new).with(:url => 'http://example.com').and_return(url)
url.should_receive(:save!)
post :make_short, :url => 'http://example.com'
end
A context block is used for grouping similar examples.