DEV: Fix another frozen string error.

app/controllers/application_controller.rb

@@ -775,8 +775,7 @@ class ApplicationController < ActionController::Base
     end
 
     @container_class = "wrap not-found-container"
-    @slug = params[:slug].presence || params[:id].presence || ""
-    @slug.tr!('-', ' ')
+    @slug = (params[:slug].presence || params[:id].presence || "").tr('-', '')
     @hide_search = true if SiteSetting.login_required
     render_to_string status: status, layout: layout, formats: [:html], template: '/exceptions/not_found'
   end

spec/requests/application_controller_spec.rb

@@ -189,10 +189,15 @@ RSpec.describe ApplicationController do
         expect(response).to redirect_to("/forum/t/#{new_topic.slug}/#{new_topic.id}/#{new_topic.posts.last.post_number}")
       end
 
-      it 'should return 404 and show Google search' do
+      it 'should return 404 and show Google search for an invalid topic route' do
         get "/t/nope-nope/99999999"
+
         expect(response.status).to eq(404)
-        expect(response.body).to include(I18n.t('page_not_found.search_button'))
+
+        response_body = response.body
+
+        expect(response_body).to include(I18n.t('page_not_found.search_button'))
+        expect(response_body).to have_tag("input", with: { value: 'nopenope' })
       end
 
       it 'should not include Google search if login_required is enabled' do

spec/requests/posts_controller_spec.rb

@@ -1648,6 +1648,20 @@ describe PostsController do
 
   describe '#latest' do
     context 'private posts' do
+      describe 'when not logged in' do
+        it 'should return the right response' do
+          Fabricate(:post)
+
+          get "/private-posts.rss"
+
+          expect(response.status).to eq(404)
+
+          expect(response.body).to have_tag(
+            "input", with: { value: "private_posts" }
+          )
+        end
+      end
+
       it 'returns private posts rss feed' do
         sign_in(admin)