Fix #463 - Fetch and display previews of URLs using OpenGraph tags

spec/models/preview_card_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe PreviewCard, type: :model do
+
+end

spec/models/subscription_spec.rb

@@ -1,5 +1,5 @@
 require 'rails_helper'
 
 RSpec.describe Subscription, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+
 end