Add tests for debates and comments admin index

spec/features/admin/comments_spec.rb

@@ -5,4 +5,13 @@ describe "Admin comments" do
     admin = create(:administrator)
     login_as(admin.user)
   end
+
+  scenario "Index" do
+    create(:comment, body: "Everything is awesome")
+
+    visit admin_root_path
+    within("#side_menu") { click_link "Comments" }
+
+    expect(page).to have_content "Everything is awesome"
+  end
 end