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

Take a snapshot - ngvikings

Avatar for Bo Vandersteene Bo Vandersteene
May 28, 2019
Programming
0
190

Take a snapshot - ngvikings

Avatar for Bo Vandersteene

Bo Vandersteene

May 28, 2019
Tweet

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
Eloquentを使ってどこまでコードの治安を保てるのか？を新人が考察してみた
Avatar for ito_kohhh itokoh0405
0
3.1k
Snowflake リリースに注意を払いたくなる話
Avatar for 金綱 雅也 masaaya
0
100
ネストしたdata classの面倒な更新にさようなら！Lensを作って理解するArrowのOpticsの世界
Avatar for shiita0903 shiita0903
1
300
Verilator + Rust + gRPC と Efinix の RISC-V でAIアクセラレータをAIで作ってる話 RTLを語る会(18) 2025/11/08
Avatar for Ryuji Fuchikami ryuz88
0
340
Introducing RemoteCompose: break your UI out of the app sandbox.
Avatar for Nicolas Roard camaelon
2
540
Designing Repeatable Edits: The Architecture of . in Vim
Avatar for Satoru Kitaguchi satorunooshie
0
260
r2-image-worker
Avatar for Yusuke Wada yusukebe
1
170
最新のDirectX12で使えるレイトレ周りの機能追加について
Avatar for Pocol projectasura
0
150
Functional Calisthenics in Kotlin: Kotlinで「関数型エクササイズ」を実践しよう
Avatar for Kent OHASHI lagenorhynque
0
120
AI POSにおけるLLM Observability基盤の導入 ― サイバーエージェントDXインターン成果報告
Avatar for ♛Heitor Hirose hekuchan
0
480
AIの弱点、やっぱりプログラミングは人間が(も)勉強しよう / YAPC AI and Programming
Avatar for Naoki Kishida kishida
8
3.6k
Claude Code on the Web を超える!? Codex Cloud の実践テク5選
Avatar for スナガク sunagaku
0
480

Featured

See All Featured
Large-scale JavaScript Application Architecture
Avatar for Addy Osmani addyosmani
514
110k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
Avatar for Chris Coyier chriscoyier
508
140k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
Avatar for Joe Casabona jcasabona
34
2.5k
Practical Orchestrator
Avatar for Shlomi Noach shlominoach
190
11k
Reflections from 52 weeks, 52 projects
Avatar for Jefferson Lam jeffersonlam
355
21k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
Avatar for Eileen M. Uchitelle eileencodes
26
3.2k
How STYLIGHT went responsive
Avatar for nonsquared nonsquared
100
5.9k
Building a Scalable Design System with Sketch
Avatar for Laura Van Doore lauravandoore
463
33k
Distributed Sagas: A Protocol for Coordinating Microservices
Avatar for Caitie McCaffrey caitiem20
333
22k
Fireside Chat
Avatar for paigeccino paigeccino
41
3.7k
Optimizing for Happiness
Avatar for Tom Preston-Werner mojombo
379
70k
How Fast Is Fast Enough? [PerfNow 2025]
Avatar for Tammy Everts tammyeverts
3
320

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