Ambethia

Testing your Rails helpers in an isolated context is made a lot easier with Geoffrey Grosenbach’s HelperTestCases. One thing however is still missing. assert_select is great for cutting through the response bodies in your functional and integration tests. Here’s how to use it outside those contexts:

require File.dirname(__FILE__) + ‘/../../test_helper’

require ‘ostruct’


	
class BuyerHelperTest < HelperTestCase

  include BuyerHelper

  def test_should_render_latest_posts
    # capture the output of your helper
    html = render_latest_posts(feed_uri)

    @response = OpenStruct.new :body => html, :headers => {“Content-Type” => “text/html”}
    assert_select “table.latest_posts tr” do |rows|
      ...
    end
  end

	
end

If you’re already using a mocking/stubbing library in your tests, you can forgo the OpenStruct stuff (including ‘ostruct’), in favor of just stubbing it out:

<pre>@response = stub(:body => html, :headers => {"Content-Type" => "text/html"})</pre>

For Rails 2.0 you’ll also need to make some adjustments:

<pre>@response = stub(:body => html, :content_type => "text/html")</pre>