FEATURE: add nofollow to RSS alternate link in topics and categories (#16013)

* FEATURE: add nofollow to RSS alternate link in topics and categories

* Rspec tests for category and topic view: add nofollow to RSS alternate link

spec/views/list/list.erb_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe "list/list.erb" do
+  fab!(:category) { Fabricate(:category) }
+
+  it "add nofollow to RSS alternate link for category" do
+    view.stubs(:include_crawler_content?).returns(false)
+    view.stubs(:url_for).returns('https://www.example.com/test.rss')
+    view.instance_variable_set("@rss", false)
+    view.instance_variable_set("@category", category)
+    render template: 'list/list', formats: []
+
+    expect(view.content_for(:head)).to match(/<link rel="alternate nofollow" type="application\/rss\+xml" title="[^"]+" href="https:\/\/www.example.com\/test\.rss" \/>/)
+  end
+
+end

spec/views/topics/show.html.erb_spec.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+require "ostruct"
+
+describe "topics/show.html.erb" do
+  fab!(:topic) { Fabricate(:topic) }
+
+  it "add nofollow to RSS alternate link for topic" do
+    topic_view = OpenStruct.new(
+      topic: topic,
+      posts: []
+    )
+    topic_view.stubs(:summary).returns('')
+    view.stubs(:crawler_layout?).returns(false)
+    view.stubs(:url_for).returns('https://www.example.com/test.rss')
+    view.instance_variable_set("@topic_view", topic_view)
+    render template: 'topics/show', formats: [:html]
+
+    expect(view.content_for(:head)).to match(/<link rel="alternate nofollow" type="application\/rss\+xml" title="[^"]+" href="https:\/\/www.example.com\/test\.rss" \/>/)
+  end
+
+end