From f7ac5384258f02fc2f4da681338f928a5363b19c Mon Sep 17 00:00:00 2001
From: Tim Zallmann <tzallmann@gitlab.com>
Date: Thu, 26 Jul 2018 15:00:18 +0000
Subject: DNS Prefetching + Preconnect of assets_host (CDN Domain)

---
 spec/views/layouts/_head.html.haml_spec.rb | 33 ++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'spec/views/layouts')

diff --git a/spec/views/layouts/_head.html.haml_spec.rb b/spec/views/layouts/_head.html.haml_spec.rb
index e8e6d2e7a75..9d1efcabb80 100644
--- a/spec/views/layouts/_head.html.haml_spec.rb
+++ b/spec/views/layouts/_head.html.haml_spec.rb
@@ -29,6 +29,39 @@ describe 'layouts/_head' do
     expect(rendered).to match(%{content="foo&quot; http-equiv=&quot;refresh"})
   end
 
+  context 'when an asset_host is set and feature is activated in the config it will' do
+    let(:asset_host) { 'http://assets' }
+
+    before do
+      stub_feature_flags(asset_host_prefetch: true)
+      allow(ActionController::Base).to receive(:asset_host).and_return(asset_host)
+    end
+
+    it 'add a link dns-prefetch tag' do
+      render
+      expect(rendered).to match('<link href="http://assets" rel="dns-prefetch">')
+    end
+
+    it 'add a link preconnect tag' do
+      render
+      expect(rendered).to match('<link crossorigin="" href="http://assets" rel="preconnnect">')
+    end
+  end
+
+  context 'when an asset_host is set and feature is not activated in the config it will' do
+    let(:asset_host) { 'http://assets' }
+
+    before do
+      stub_feature_flags(asset_host_prefetch: false)
+      allow(ActionController::Base).to receive(:asset_host).and_return(asset_host)
+    end
+
+    it 'not add a link dns-prefetch tag' do
+      render
+      expect(rendered).not_to match('<link href="http://assets" rel="dns-prefetch">')
+    end
+  end
+
   def stub_helper_with_safe_string(method)
     allow_any_instance_of(PageLayoutHelper).to receive(method)
       .and_return(%q{foo" http-equiv="refresh}.html_safe)
-- 
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