Add webmock for external requests in tests

external_request.rb needs to be required before lint is run.

spec/support/external_request.rb

@@ -0,0 +1,29 @@
+# Mock external requests to youtube
+require 'webmock/rspec'
+WebMock.disable_net_connect!(allow_localhost: true)
+
+RSpec.configure do |config|
+  config.before(:each) do
+    mock_commercial_request
+  end
+end
+
+def mock_commercial_request
+  response = {
+    author_name: 'Confreaks',
+    html: '<iframe width=\'560\' height=\'315\' src=\'https://www.youtube.com/embed/BTTygyxuGj8?feature=oembed\' frameborder=\'0\' allowfullscreen></iframe>',
+    thumbnail_width: 480,
+    thumbnail_url: 'https://i.ytimg.com/vi/BTTygyxuGj8/hqdefault.jpg',
+    provider_name: 'YouTube',
+    width: 459,
+    type: 'video',
+    provider_url: 'http://www.youtube.com/',
+    version: '1.0',
+    thumbnail_height: 360,
+    title: 'RailsConf 2014 - Closing Keynote by Aaron Patterson',
+    author_url: 'https://www.youtube.com/user/Confreaks',
+    height: 344
+  }
+  WebMock.stub_request(:get, /.*youtube.*/).
+    to_return(status: 200, body: response.to_json, headers: {})
+end