AO3-7426 Adjust page subtitle for showing a wrangling guideline

app/controllers/wrangling_guidelines_controller.rb

@@ -9,6 +9,7 @@ def index
   # GET /wrangling_guidelines/1
   def show
     @wrangling_guideline = WranglingGuideline.find(params[:id])
+    @page_subtitle = @wrangling_guideline.title
   end
 
   # GET /wrangling_guidelines/new

features/tags_and_wrangling/wrangling_guidelines.feature

@@ -16,6 +16,7 @@ Feature: Wrangling Guidelines
   When I go to the wrangling_guidelines page
     And I follow "Intro and General Concepts"
   Then I should see "This series of documents (Wrangling Guidelines) are intended to help tag wranglers remain consistent as they go about the business of wrangling tags by providing a set of formatting guidelines." within ".userstuff"
+    And the page title should include "Intro and General Concepts"
 
   Scenario: Edit Wrangling Guideline
 

spec/controllers/wrangling_guidelines_controller_spec.rb

@@ -26,6 +26,11 @@
       expect(response).to render_template("show")
       expect(assigns(:wrangling_guideline)).to eq(guideline)
     end
+
+    it "assigns page subtitle using guideline title" do
+      get :show, params: { id: guideline.id }
+      expect(assigns[:page_subtitle]).to eq(guideline.title)
+    end
   end
 
   describe "GET #new" do