Testing Views with Rails 3 and Rspec2 - Can't stub request.path_params[:controller]

I am stuck to test a specific view which contains a
request.path_parameters[:controller] variable as the example below
follows:

<%=link_to "Store", admin_stores_url, { :id => "tab-3" ,:class =>

(admin_stores_path == ‘/’ + request.path_parameters[:controller] &&
‘active’)} %>

The rspec view test file:

describe "displaying the index file" do

      it "should have the #tab-3 selector id, for example" do
         controller.request.path_parameters["controller"].should

eq(“admin/stores”)
render
rendered.should =~ /#tab-3/
end
end

The given error:

Failure/Error: render
     ActionView::Template::Error:
       can't convert nil into String
     # ./app/views/admin/settings/_menu.html.erb:5:in `+'
     # ./app/views/admin/settings/_menu.html.erb:5:in

_app_views_admin_settings__menu_html_erb__3443097722112408564_2172534220_4114188497869029268' # ./app/views/admin/stores/index.html.erb:6:inblock in
_app_views_admin_stores_index_html_erb___284062528844236588_2236860180__1529683073472994564’
# ./app/views/admin/stores/index.html.erb:5:in
_app_views_admin_stores_index_html_erb___284062528844236588_2236860180__1529683073472994564' # ./spec/views/admin/stores/index.html.erb_spec.rb:17:inblock
(3 levels) in <top (required)>’

Any ideas about how to stub or simulate the
request.path_parameters[:controller]?

Thanks.

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