1 files changed, 38 insertions, 0 deletions
diff --git a/spec/initializers/rails_asset_host_spec.rb b/spec/initializers/rails_asset_host_spec.rb
new file mode 100644
index 00000000000..eb69c1fa85b
--- /dev/null
+++ b/spec/initializers/rails_asset_host_spec.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Rails asset host initializer' do
+  def load_initializer
+    load Rails.root.join('config/initializers/rails_asset_host.rb')
+  end
+
+  around do |example|
+    old_asset_host = Rails.application.config.action_controller.asset_host
+
+    example.run
+
+    Rails.application.config.action_controller.asset_host = old_asset_host
+    ActionController::Base.asset_host = old_asset_host
+  end
+
+  subject { Rails.application.config.action_controller.asset_host }
+
+  it 'uses no asset host by default' do
+    load_initializer
+
+    expect(subject).to be nil
+  end
+
+  context 'with cdn_host defined in gitlab.yml' do
+    before do
+      stub_config_setting(cdn_host: 'https://gitlab.example.com')
+    end
+
+    it 'returns https://gitlab.example.com' do
+      load_initializer
+
+      expect(subject).to eq('https://gitlab.example.com')
+    end
+  end
+end