jeregrine

def index(conn, %{"event" => "true"}) do                                                                       
  conn = conn                                                                                                  
          |> put_resp_content_type("text/event-stream")                                                        
          |> send_chunked(200)                                                                                 
  {:ok, conn} = chunk(conn, ["data: ", JSON.encode!(Thermostat.Data.get()), "\n\n"])                           
  Phoenix.Topic.subscribe self, "data"                                                                         
  data_updated(conn)                                                                                           
end 

defp data_updated(conn) do                                                                                     

andyjbas

# env.rb or spec_helper.rb

Capybara.register_driver :poltergeist do |app|
  opts = {
    extensions: ["#{Rails.root}/features/support/phantomjs/disable_animations.js"] # or wherever
  }

  Capybara::Poltergeist::Driver.new(app, opts)
end