Add specs for icon_for_service.

spec/helpers/application_helper_spec.rb

@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+describe ApplicationHelper do
+  describe '#icon_for_service' do
+    it 'returns a correct icon tag for Twitter' do
+      icon = icon_for_service(:twitter)
+      expect(icon).to be_html_safe
+      elem = Nokogiri(icon).at('i.fa.fa-twitter')
+      expect(elem).to be_a Nokogiri::XML::Element
+    end
+
+    it 'returns a correct icon tag for GitHub' do
+      icon = icon_for_service(:github)
+      expect(icon).to be_html_safe
+      elem = Nokogiri(icon).at('i.fa.fa-github')
+      expect(elem).to be_a Nokogiri::XML::Element
+    end
+
+    it 'returns a correct icon tag for other services' do
+      icon = icon_for_service(:'37signals')
+      expect(icon).to be_html_safe
+      elem = Nokogiri(icon).at('i.fa.fa-lock')
+      expect(elem).to be_a Nokogiri::XML::Element
+    end
+  end
+end