thiagoa

def call(user, count: 20)
  tweets = fetch_user_timeline(user, count: count)
  Result.new(:ok, tweets)
rescue Twitter::Error::NotFound
  Result.new(:not_found, [])
end

thiagoa

context 'when the timeline is forbidden' do
  it 'returns a result with no tweets and forbidden status' do
    twitter_client = double('twitter_client')
    allow(twitter_client).to receive(:user_timeline)
      .with('screen_name', count: 5)
      .once { fail Twitter::Error::Unauthorized }

    twitter_timeline_hub = TwitterTimelineHub.new(twitter_client)
    result = twitter_timeline_hub.call('screen_name', count: 5)

thiagoa

def call(user, count: 20)
  tweets = fetch_user_timeline(user, count: count)
  Result.new(:ok, tweets)
rescue Twitter::Error::NotFound
  Result.new(:not_found, [])
rescue Twitter::Error::Unauthorized
  Result.new(:forbidden, [])
end

thiagoa

context 'when the timeline is unauthorized' do
  # previous context here
  
  context 'when the unauthorized error refers to an invalid token' do
    it 'fails' do
      twitter_client = instance_double(Twitter::REST::Client)
      allow(twitter_client).to receive(:user_timeline)
        .with('screen_name', count: 5)
        .once {
          fail Twitter::Error::Unauthorized, 'Invalid or expired token'

thiagoa

class TwitterTimelineHub
  Result = Struct.new(:status, :tweets)

  def initialize(twitter_client = TwitterClientFactory.new.call)
    @twitter_client = twitter_client
  end

  def call(user, count: 20)
    tweets = fetch_user_timeline(user, count: count)
    Result.new(:ok, tweets)

thiagoa

# app/controllers/home_controller.rb
class HomeController < ApplicationController
end

thiagoa

# app/controllers/twitter_timeline_controller.rb
class TwitterTimelineController < ApplicationController
end

thiagoa

import { expect } from 'chai';
import createFixture from '../support/createFixture';

describe('renderCartTotal', () => {
  // Declare shared environment variables
  let fixture;

  beforeEach(() => {
    // Setup the environment
    fixture = createFixture({ html: '<div data-js-cart-total></div>' });

thiagoa

import { expect } from 'chai';
import createFixture from '../support/createFixture';

function renderCartTotal({ domNode, itemPrices }) {
  const sum = itemPrices.reduce((total, price) => total + price, 0);
  const formattedPrice = `$${sum}`;

  domNode.innerHTML = formattedPrice;
}

thiagoa

// spec/javascripts/support/createFixture.js

function createFixtureNode() {
  const fixture = document.createElement('div');

  fixture.id = 'fixture';
  fixture.destroy = function destroy() {
    this.parentNode.removeChild(fixture);
  };