I don't like that we have to do this. 

What do you think about doing something like this?:

```ruby
class WorldwideSlimmerHeadersTest < ActionController::TestCase
  tests WorldLocationNewsArticle

  tests "adds world location slimmer header if the document can be associated with a world location" do
    # ...
  end

  tests "adds worldwide organisation slimmer header if the document can be associated with a worldwide organisation" do
  # ...
  end
end
```