Add simple admin overview of PuSH subscriptions

spec/controllers/admin/pubsubhubbub_controller_spec.rb

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+# frozen_string_literal: true
+require 'rails_helper'
+
+RSpec.describe Admin::PubsubhubbubController, type: :controller do
+  describe 'GET #index' do
+    before do
+      sign_in :user, Fabricate(:user, admin: true)
+    end
+
+    it 'returns http success' do
+      get :index
+      expect(response).to have_http_status(:success)
+    end
+  end
+end

spec/helpers/admin/pubsubhubbub_helper_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+# Specs in this file have access to a helper object that includes
+# the Admin::PubsubhubbubHelper. For example:
+#
+# describe Admin::PubsubhubbubHelper do
+#   describe "string concat" do
+#     it "concats two strings with spaces" do
+#       expect(helper.concat_strings("this","that")).to eq("this that")
+#     end
+#   end
+# end
+RSpec.describe Admin::PubsubhubbubHelper, type: :helper do
+  pending "add some examples to (or delete) #{__FILE__}"
+end