Testando Software para Dormir Melhor

Transcript

1. TESTANDO SOFTWARE PARA DORMIR MELHOR
2. @dodecaphonic
3. ENTROPIA
4. BIT ROT
5. POR QUE INVESTIR EM TESTAGEM AUTOMÁTICA?
6. QUALIDADE
7. TCO
8. CONFIANÇA
9. DIGA NÃO A ARGUMENTOS BASEADOS EM
10. MEDO
11. MORALIDADE
12. DOGMA
13. TERMINOLOGIA
14. UNIT TESTS
15. INTEGRATION TESTS
16. ACCEPTANCE TESTS / SYSTEM TESTS
17. TDD
18. O QUE FAZ O ATO DE TESTAR ALGO DIFÍCIL?
19. LEGADO VS NOVO
20. ACOPLAMENTO
21. class DoSomethingImportant def do_it user = User.find_by(email: user_email) product = Product.find(product_id) availability = backend.check_availability(product) if availability.any_available? reservation = backend.reserve_for_purchase(product) if points_program.eligible?(user) backend.pay_with_points(reservation, points_program.authorize(user, allocated_points)) else backend.pay_with_credit_card(reservation, credit_card_information) end else fail NoProductsAvailableError end end end
22. class DoSomethingImportant def do_it user = User.find_by(email: user_email) product = Product.find(product_id) availability = backend.check_availability(product) if availability.any_available? reservation = backend.reserve_for_purchase(product) if points_program.eligible?(user) backend.pay_with_points(reservation, points_program.authorize(user, allocated_points)) else backend.pay_with_credit_card(reservation, credit_card_information) end else fail NoProductsAvailableError end end end
23. class DoSomethingImportant def do_it user = User.find_by(email: user_email) product = Product.find(product_id) availability = backend.check_availability(product) if availability.any_available? reservation = backend.reserve_for_purchase(product) if points_program.eligible?(user) backend.pay_with_points(reservation, points_program.authorize(user, allocated_points)) else backend.pay_with_credit_card(reservation, credit_card_information) end else fail NoProductsAvailableError end end end
26. customer.orders.first.order_items.first.product.name
27. ESTADO GLOBAL
30. MISTURA DE RESPONSABILIDADES
31. class OrdersController < ApplicationController def create @order = Order.new(order_params) if order.save fulfillment = Backend.new.fulfill_order(order) if fulfillment OrderMailer.order_confirmation(order.customer).deliver_n ow redirect_to confirmation_order_path(order), notice: 'Yes!' else OrderMailer.order_failed(order.customer).deliver_now redirect_to confirmation_order_path(order), alert: 'No!' end else flash[:alert] = 'Oh, oh! No order for you!' render :new end end end
32. RAILS
33. COMO FUGIR DESSE SOFRIMENTO?
34. SOLID
35. SOLID SINGLE RESPONSIBILITY PRINCIPLE
36. class FooBarBaz def initialize(foo, bar, baz) @foo = foo @bar = bar @baz = baz end def change_things_everywhere if @foo do_foo elsif @bar do_bar elsif @baz do_baz end end # !!... end
37. SOLID LISKOV SUBSTITUTION PRINCIPLE
38. class Shape def rotate(deg) fail 'Child, do this' end end class Square < Shape def rotate(deg) # !!... end end class Circle < Shape def rotate(deg) self end end class RotationTool def rotate(shape, deg) shape.rotate(deg) end end
39. class Shape def rotate(deg) fail 'Child, do this' end end class Square < Shape def rotate(deg) # !!... end end class Circle < Shape def rotate(deg) self end end class RotationTool def rotate(shape, deg) shape.rotate(deg) end end
40. SOLID DEPENDENCY INVERSION PRINCIPLE
41. class CreateOrder def initialize(product_id, params) @product_id = product_id @params = params end attr_reader :product_id, :params def call product = Product.find(product_id) order = Backend.new.create_order(product, params) # !!... end end
42. class CreateOrder def initialize(product_id, params, product_repository, backend) @product_id = product_id @params = params @product_repository = product_repository @backend = backend end attr_reader :backend, :product_repository, :product_id, :params def call product = product_repository.find(product_id) order = backend.create_order(product, params) # !!... end end
43. CreateOrder.new(1, { recurring: true }, Product, Backend.new)
44. class CreateOrder def initialize(backend = Backend.new) @backend = backend end attr_reader :backend def call(product, params) order = backend.create_order(product, params) # !!... end end
45. RSpec.describe CreateOrder do let(:backend) { double('Backend') } subject { described_class.new(backend) } describe '#call' do context 'when the Backend cannot be reached' do before do expect(backend) .to receive(:create_order) .and_raise(Errno!::ENETUNREACH) end it 'wraps the error' do expect { subject.call(nil, nil) } .to raise_error(OrderCreationError) end end end end
46. RSpec.describe CreateOrder do subject { described_class.new(backend) } describe '#call' do context 'when the Backend cannot be reached' do let(:backend) do Class.new def create_order(*) fail Errno!::ENETUNREACH end end.new end it 'wraps the error' do expect { subject.call(nil, nil) } .to raise_error(OrderCreationError) end end end end
47. AINDA NÃO SEI O QUE FAZER
53. OBRIGADO