Add basic system test for topic navigation

Author: rossta

spec/system/topics_spec.rb

@@ -0,0 +1,32 @@
+require "rails_helper"
+
+RSpec.describe "Topics", type: :system do
+  it "displays the topics and provides navigation links" do
+    Page.upsert_from_sitepress!(limit: 3)
+
+    expect(Page.count).to eq(3)
+
+    Page.find_each do |model|
+      model.topics = FactoryBot.create_list(:topic, 2, :approved)
+      model.save!
+    end
+
+    visit topics_path
+
+    expect(page).to have_content("Topics")
+
+    Topic.approved.find_each do |topic|
+      expect(page).to have_link(topic.name, href: topic_path(topic))
+    end
+
+    topic = Topic.first
+
+    click_link topic.name
+
+    expect(page).to have_content(topic.name)
+
+    topic.pages.each do |model|
+      expect(page).to have_link(model.title, href: model.request_path)
+    end
+  end
+end