Testing helpers with RSpec

Hi all

I have a helper that generates HTML for dynamically adding items to a class. It uses Formtastic for the fields:

module Admin   module CompetitionsHelper     def add_competition_class_link(form_builder)       link_to_function "Add competition class" do |page|         form_builder.semantic_fields_for :competition_classes, CompetitionClass.new, :child_index => 'NEW_RECORD' do |p|           html = render(:partial => 'competition_class_form', :object => p)           page << "$('#competition_classes').append('# {escape_javascript(html)}'.replace(/NEW_RECORD/g, new Date().getTime ()));"         end       end     end   end end

Now I have a problem with testing this with RSpec. I can mock the SemanticFormBuilder but that does not really check that the correct HTML is being added. I also have problems mocking the block which leaves it unseen by Rcov and 100% coverage is lost.

Does anyone have a good way of testing things like these?

Regards

Erik