Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Take a snapshot - ngvikings

Sponsored · Ship Features Fearlessly Turn features on and off without deploys. Used by thousands of Ruby developers. →
Avatar for Bo Vandersteene Bo Vandersteene
May 28, 2019
Programming
200
0

Take a snapshot - ngvikings

Avatar for Bo Vandersteene

Bo Vandersteene

May 28, 2019

More Decks by Bo Vandersteene

See All by Bo Vandersteene
Nest the backend for your Angular Application #ijs2019
Avatar for Bo Vandersteene bovandersteene
0
110
AgentConf - Where is my error gone?
Avatar for Bo Vandersteene bovandersteene
0
370
Nest the backend for your Angular Application @AngularConnect
Avatar for Bo Vandersteene bovandersteene
2
1.2k

Other Decks in Programming

See All in Programming
今こそ押さえておきたい アマゾンウェブサービス（AWS）の データベースの基礎 おもクラ #6版
Avatar for Satoshi Kaneyasu satoshi256kbyte
1
240
事業会社でのセキュリティ長期インターンについて
Avatar for inlet-back masachikaura
0
250
Codex CLIのSubagentsによる並列API実装 / Parallel API Implementation with Codex CLI Subagents
Avatar for 冨澤宝斗 takatty
2
920
ルールルルルルRubyの中身の予備知識 ── RubyKaigiの前に予習しなイカ？
Avatar for ydah ydah
1
180
L’IA au service des devs : Anatomie d'un assistant de Code Review
Avatar for Thomas Boileau toham
0
250
セグメントとターゲットを意識するプロポーザルの書き方 〜採択の鍵は、誰に刺すかを見極めるマーケティング戦略にある〜
Avatar for memory m3m0r7
PRO
0
520
飯MCP
Avatar for Yusuke Wada yusukebe
0
510
ハーネスエンジニアリングにどう向き合うか 〜ルールファイルを超えて開発プロセスを設計する〜 / How to approach harness engineering
Avatar for r-kagaya rkaga
22
12k
Running Swift without an OS
Avatar for Kishikawa Katsumi kishikawakatsumi
0
830
Codex CLI でつくる、Issue から merge までの開発フロー
Avatar for amata1219 amata1219
0
360
Claude Codeをカスタムして自分だけのClaude Codeを作ろう
Avatar for Terisuke terisuke
0
130
forteeの改修から振り返るPHPerKaigi 2026
Avatar for muno92 muno92
PRO
3
280

Featured

See All Featured
Building an army of robots
Avatar for Kyle Neath kneath
306
46k
The Web Performance Landscape in 2024 [PerfNow 2024]
Avatar for Tammy Everts tammyeverts
12
1.1k
What's in a price? How to price your products and services
Avatar for Michael Herold michaelherold
247
13k
YesSQL, Process and Tooling at Scale
Avatar for Rocio Delgado rocio
174
15k
The Spectacular Lies of Maps
Avatar for Per Axbom axbom
PRO
1
700
Dominate Local Search Results - an insider guide to GBP, reviews, and Local SEO
Avatar for Greg Gifford greggifford
PRO
0
140
Building Adaptive Systems
Avatar for Chris Keathley keathley
44
3k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
Avatar for Sam Stephenson sstephenson
162
16k
Music & Morning Musume
Avatar for Bryan Veloso bryan
47
7.2k
How to Ace a Technical Interview
Avatar for Jacob Kaplan-Moss jacobian
281
24k
My Coaching Mixtape
Avatar for mlcsv mlcsv
0
98
How to Align SEO within the Product Triangle To Get 
Buy-In & Support - #RIMC
Avatar for Aleyda Solis aleyda
1
1.5k

Transcript

  1. Take a snapshot Bo Vandersteene @reibo_bo

  2. @reibo_bo @reibo_bo @bo.vandersteene Software Engineer & Coach

  3. Snapshot

  4. None

  5. Snapshot a component

  6. None
  7. None
  8. None

  9. Snapshot a block of code

  10. None
  11. None

  12. Test case Render UI component Test against snapshot

  13. How we do it with Jasmine

  14. None

  15. • A lot of lines • Forget code to test

    • Hard to define all cases • Nice feedback • ...

  16. Should we skip

  17. E2E <> Unit

  18. Unit test - Small easily - Function - Class -

    Complex algorithm

  19. E2E test - Take screenshots - Entire application - Flows

    - Cypress, protractor, ...

  20. Unit tests !

  21. Testing is HARD

  22. None

  23. Why Jest Fast Sandboxed Zero Config Snapshots Error reporting

  24. Zero config

  25. http://bit.ly/2M28O9W

  26. http://bit.ly/2M28O9W

  27. http://bit.ly/2M28O9W

  28. http://bit.ly/2M28O9W Each app/lib tsconfig.spec.json

  29. http://bit.ly/2M28O9W

  30. http://bit.ly/2M28O9W Each app/lib angular.json

  31. http://bit.ly/2M28O9W

  32. http://bit.ly/2M28O9W

  33. http://bit.ly/2M28O9W

  34. Snapshot testing

  35. None
  36. None
  37. None
  38. None

  39. • Creates the snapshot if it doesn’t exist

  40. • Creates the snapshot if it doesn’t exist

  41. • Creates the snapshot if it doesn’t exist

  42. None
  43. None

  44. • Creates the snapshot if it doesn’t exist • Compares

    expectation to stored snapshot • Performs a diff

  45. • Creates the snapshot if it doesn’t exist • Compares

    expected to stored snapshot • Performs a diff • Easily update snapshot on refactor

  46. • Creates the snapshot if it doesn’t exist • Compares

    expected to stored snapshot • Performs a diff • Easily update snapshot on refactor

  47. Commit snapshot

  48. Not only components!

  49. None
  50. None
  51. None

  52. RxJs

  53. None
  54. None
  55. None
  56. None

  57. Globals

  58. Globals afterAll afterEach beforeAll beforeEach describe.each describe.only describe.only.each describe.skip describe.skip.each

    test.each test.only test.only.each test.skip test.skip.each test.todo describe test
  59. None
  60. None
  61. None
  62. None

  63. Mock

  64. None
  65. None
  66. None
  67. None
  68. None
  69. None
  70. None
  71. None
  72. None

  73. Tips & Tricks

  74. Make your tests your documentation

  75. Test logic

  76. Use beforEach Use afterEach

  77. Treat snapshots as code

  78. Tests should be deterministic

  79. Units NOT methods

  80. ng test -u

  81. Commit snapshots

  82. ci-tools ng test

  83. Love testing

  84. Thank You @reibo_bo @bo.vandersteene https://github.com/reibo/jest-example