Add test for switch app link

app/views/layouts/application.html.erb

@@ -37,6 +37,11 @@
     href: services_path,
     active: current_page?(services_path),
   }
+
+  menu_option << {
+    text: "Switch app",
+    href: Plek.find("signon"),
+  }
 %>
 
 <%= render "govuk_publishing_components/components/layout_header", {

spec/system/main_menu_spec.rb

@@ -9,27 +9,29 @@
       stub_organisations_api_has_organisations_with_bodies([{ "title" => "Department of Randomness", "details" => { "slug" => "random-department" } }])
     end
 
-    it "shows only the Services menu item" do
+    it "shows only the Services/Switch app menu items" do
       visit "/"
 
       within(".govuk-header__container") do
-        expect(page).not_to have_content("Broken Links")
-        expect(page).not_to have_content("Councils")
-        expect(page).to have_content("Services")
+        expect(page).not_to have_link("Broken Links")
+        expect(page).not_to have_link("Councils")
+        expect(page).to have_link("Services")
+        expect(page).to have_link("Switch app")
       end
     end
   end
 
   context "as a GDS Editor" do
     before { login_as_gds_editor }
 
-    it "shows all three menu options" do
+    it "shows all four menu options" do
       visit "/"
 
       within(".govuk-header__container") do
-        expect(page).to have_content("Broken Links")
-        expect(page).to have_content("Councils")
-        expect(page).to have_content("Services")
+        expect(page).to have_link("Broken Links")
+        expect(page).to have_link("Councils")
+        expect(page).to have_link("Services")
+        expect(page).to have_link("Switch app")
       end
     end
   end