AO3-7398 Add username to Challenge Sign-Ups browser page title

app/controllers/challenge_signups_controller.rb

@@ -85,6 +85,7 @@ def index
     if params[:user_id] && (@user = User.find_by(login: params[:user_id]))
       if current_user == @user
         @challenge_signups = @user.challenge_signups.order_by_date
+        @page_subtitle = t(".page_title", username: @user.login)
         render action: :index and return
       else
         flash[:error] = ts("You aren't allowed to see that user's sign-ups.")

config/locales/controllers/en.yml

@@ -114,6 +114,8 @@ en:
     index:
       page_title: "%{username} - Challenge Claims"
   challenge_signups:
+    index:
+      page_title: "%{username} - Challenge Sign-ups"
     new:
       page_title: New Challenge Sign-up
   chapters:

spec/controllers/challenge_signups_controller_spec.rb

@@ -81,6 +81,14 @@
       it_redirects_to_with_error(closed_collection,
                                  "You aren't allowed to see the CSV summary.")
     end
+
+    context "when user visits their own sign-ups" do
+      it "sets the page subtitle correctly" do
+        fake_login_known_user(user)
+        get :index, params: { user_id: user.login }
+        expect(assigns(:page_subtitle)).to eq("#{user.login} - Challenge Sign-ups")
+      end
+    end
   end
 
   describe "destroy" do