rspec users - Dec 2011 - 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:in `block 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:in `block
(3 levels) in <top (required)>''

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

Thanks.

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