Hi again... This is wierd spec problem no. 3. I''ve got a simple one line RJS file that renders a partial specified by the controller page.replace_html("product_info", :partial => @product_partial) The partials in question will contain purely static content - the idea is to have some dynamic links, so you hit http://localhost:3000/gap/product_info/product_1 http://localhost:3000/gap/product_info/product_2 it will render _product_1.rhtml, _product_2.rhtml in a div etc. Ideally I''d like to write something like: page.should_receive(:replace_html).with("product_info", "product_1") So far the best I can find is to add a div with a known id to each partial and test like this: context "A rendered gap/product_info" do specify "should have RJS to update the product_info div" do assigns[:product_partial] = "product_info_rti" render ''gap/product_info'' response.should_have_rjs :replace_html, ''product_info'' end %w[ rti finance ].each do |product_type| specify "should have a product_info_#{product_type} div when the " do assigns[:product_partial] = "product_info_#{product_type}" render ''gap/product_info'' response.should_have "div#product_info_#{product_type}" end end end It''s far from ideal, because it relies on someone remembering to update the spec if a new product type is added. I can''t see a more direct way to test the RJS though. Thanks Ashley