Testing routes and controller results

I'm trying to write a functional test that generates a route and then
follows that route to the controller and confirms that the appropriate
record is retrieved.

I'm getting some unexpected errors --- I know the route works in
development mode -- and wondering if anyone has an idea of what's
happening here. Thanks for any help you can offer.

Here's the test...

def test_show_title
    @news=Article.find(1)
    get date_url(:title=>"#{@news.srctitle}",
                 :section=>"#{@news.section.name}",
                 :year=>"#{@news.created_at.year}",
                 :month=>"#{@news.created_at.month}",
                 :day=>"#{@news.created_at.mday.to_s}")

  end

and the error...

test_show_title(ArticlesControllerTest):
NoMethodError: You have a nil object when you didn't expect it!
The error occured while evaluating nil.rewrite
    /Applications/Locomotive2/Bundles/
rmagickRailsSept2006_x86.locobundle/framework/lib/ruby/gems/1.8/gems/
actionpack-1.12.5/lib/action_controller/base.rb:488:in `url_for'
    generated/routing/named_routes/date.rb:2:in `date_url'
    /Applications/Locomotive2/Bundles/
rmagickRailsSept2006_x86.locobundle/framework/lib/ruby/gems/1.8/gems/
actionpack-1.12.5/lib/action_controller/test_process.rb:431:in
`method_missing'
    ./test/functional/articles_controller_test.rb:33:in
`test_show_title'