Replace pusher with action cable (#178)

closes #43

spec/controllers/room_channel_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+RSpec.describe RoomChannel, type: :channel do
+  let!(:user) { create(:user) }
+
+  before do
+    stub_connection
+  end
+
+  it 'subscribes to a stream when pubsub_token is provided' do
+    subscribe(pubsub_token: user.uid)
+    expect(subscription).to be_confirmed
+    expect(subscription).to have_stream_for(user.uid)
+  end
+end