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{
   "HttpStatusCode":200,
   "Accounts":[
      {
         "Transactions":[
            {
               "Date":"2018-11-20",
               "Code":null,
               "Description":"ABC",
               "Debit":50.00,

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# Base
class Base
  attr_reader :message

  def initialize(message)
    @message = message
  end

  def valid?
    !message.nil?

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class AliceBot < Visitor
  def respond_to_question
    "Yeah, I'm listening."
  end

  def respond_to_yell
    '🤐'
  end

  def respond_to_silence

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class BobBot < Visitor
  def respond_to_question
    'Sure.'
  end

  def respond_to_yell
    'Woah, chill out!'
  end

  def respond_to_silence

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class Visitor
  METHODS_TOBE_IMPLEMENTED = %i(
    respond_to_question respond_to_yell respond_to_silence respond_to_anything)

  attr_reader :message_types

  def initialize(*message_types)
    @message_types = message_types
  end
  

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class BobBot
  def respond(message)
    [Question, Yell, Silence, Anything].each do |type|
      return type.respond if type.valid?(message)
    end
  end
end

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# config/initializers/redis.rb
url = URI.parse(ENV.fetch("REDIS_URL") { "redis://localhost:6379/1" })
REDIS = Redis.new(url: url)

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# spec/system/chat_stories_spec.rb
require 'rails_helper'

RSpec.describe 'Chat stories' do
  before do
    allow(REDIS).to receive(:incr).with('user_count').and_return(1, 2, 3)
  end

  it "displays chat app" do
    visit root_url

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# spec/controllers/home_controller_spec.rb
require 'rails_helper'

RSpec.describe HomeController, type: :controller do
  before do
    allow(REDIS).to receive(:incr).with('user_count').and_return(1)
  end

  describe 'GET #index' do
    it "assigns username" do

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class ChatChannel < ApplicationCable::Channel
  def subscribed
    stream_from "my_channel"
  end

  def send_message(data)
    message_params = { sent_by: current_user }.merge(data['message'])
    ActionCable.server.broadcast("my_channel", message_params)
  end
end