Upstream sync

spec/features/user_managing_broadcasts_spec.rb

@@ -10,7 +10,7 @@ feature 'User managing broadcasts' do
   context 'managing broadcasts' do
     before do
       sign_in current_user
-      allow(MuxLiveStream).to receive(:new).and_return(double(id: 'id', key: 'key', playback_id: 'playback_id'))
+      stub_mux_live_stream
     end
 
     scenario "splash page is shown if there are no existing streams" do