```ruby
require 'test_helper'
class FeedsControllerTest < ActionController::TestCase
def stub_feed_url(url)
body = feed_for_url(url)
FakeWeb.register_uri(:get, "#{url}", :body => body)
end
def feed_for_url(url)
uri = URI.parse(url)
File.read("test/fixtures#{uri.path}")
end
context "on POST /subscribe" do
context "with an existing feed" do
setup do
url = "http://dummy/valid-feeds/svd.se.xml"
@user = Factory(:user)
@feed = Feed.create!(:url => url)
stub(@controller).current_user { @user }
stub_feed_url(@feed.url)
post :subscribe, :url => @feed.url
end
should_assign_to :subscription
should_respond_with :success
should_render_template :subscribe
should "create a subscription" do
assert_equal @user.subscriptions.size, 1
end
end
end
end
```
test\_helper.rb
```ruby
.
.
require "rr"
include RR::Adapters::RRMethods
class ActiveSupport::TestCase
.
.
```