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

How to write good tests?

Avatar for Alexander Beletsky Alexander Beletsky
April 12, 2013
Programming
350
2

How to write good tests?

Small talk that I gave to @debitoor guys about practices of writing tests.

Avatar for Alexander Beletsky

Alexander Beletsky

April 12, 2013

More Decks by Alexander Beletsky

See All by Alexander Beletsky
Snapshot Testing: Going beyond UI
Avatar for Alexander Beletsky alexbeletsky
1
720
Tech Culture in Startups
Avatar for Alexander Beletsky alexbeletsky
0
260
TDD in JavaScript
Avatar for Alexander Beletsky alexbeletsky
4
870
This is Node.js
Avatar for Alexander Beletsky alexbeletsky
10
470
Likeastore
Avatar for Alexander Beletsky alexbeletsky
3
180
PaaS in your pocker with Dokku
Avatar for Alexander Beletsky alexbeletsky
7
2.7k
Building Single Page Applications
Avatar for Alexander Beletsky alexbeletsky
9
5.5k
.NET developer in JavaScript world
Avatar for Alexander Beletsky alexbeletsky
1
2.9k
Dynamic web development with Oak
Avatar for Alexander Beletsky alexbeletsky
1
650

Other Decks in Programming

See All in Programming
React本体のコードリーディング
Avatar for high-g high_g_engineer
1
150
What's New in Android 2026
Avatar for Veronikapj veronikapj
0
270
AIと壁打ちしながら進めるコスト管理
Avatar for Ryoma Fujiwara fufuhu
0
1.1k
SlackアプリとLambdaの 連携を構築した話
Avatar for pawn pawn_4_s
1
130
リアルな遅延を測る仕様
Avatar for kota-yata kota_yata
1
120
VibeCodingからAgenticWorkflowへ
Avatar for starfish719 starfish719
0
700
まずはプロンプトガイドを読もう、話はそれからだ
Avatar for Akira TSURUDA kiakiraki
1
160
ここ半年くらいでAIに作らせたR用ツール
Avatar for eitsupi eitsupi
0
390
わからない話を追いかけたら、プログラミング言語を作る側にいた
Avatar for ydah ydah
3
530
2年かけて Deno に DOMMatrix を実装した話 / How I implemented DOMMatrix in Deno over two years
Avatar for petamoriken / 森建 petamoriken
0
210
言葉の格闘技のススメ～紙とペンと言葉から始める、キャリアの描き方～
Avatar for 進捗ゼミ progresscicada
2
170
使いながら育てる Claude Code — 開発フローの1コマンド化 × 繰り返し指摘の自動仕組み化
Avatar for endo shiki shiki_kakaku
0
1.9k

Featured

See All Featured
Designing Dashboards & Data Visualisations in Web Apps
Avatar for Des Traynor destraynor
232
55k
Groundhog Day: Seeking Process in Gaming for Health
Avatar for Sebastian Deterding codingconduct
0
290
How Fast Is Fast Enough? [PerfNow 2025]
Avatar for Tammy Everts tammyeverts
3
790
The Straight Up "How To Draw Better" Workshop
Avatar for Dennis Kardys denniskardys
239
140k
Faster Mobile Websites
Avatar for Dean Hume deanohume
310
32k
Deep Space Network (abreviated)
Avatar for Tony Rice tonyrice
0
260
Raft: Consensus for Rubyists
Avatar for Patrick Van Stee vanstee
141
7.6k
Measuring Dark Social's Impact On Conversion and Attribution
Avatar for Stephen Akadiri stephenakadiri
2
260
The innovator’s Mindset - 
Leading Through an Era of Exponential Change - McGill University 2025
Avatar for Jean-Marc De Jonghe jdejongh
PRO
1
270
AI Search:
Where Are We & What Can We Do About It?
Avatar for Aleyda Solis aleyda
0
7.8k
Efficient Content Optimization with Google Search Console & Apps Script
Avatar for Katarina Dahlin katarinadahlin
PRO
1
810
Building Adaptive Systems
Avatar for Chris Keathley keathley
44
3.2k

Transcript

  1. How to write good tests?

  2. Honestly, I don’t know

  3. But, there are properties of good tests…

  4. … are written before code

  5. … are running very fast

  6. … are helping to find regressions

  7. Writing unit tests is not about code verification

  8. … it’s about code quality and design

  9. Think different Think TDD

  10. Could TDD be applied to everything?

  11. In short, yes code, requirements, ui

  12. Should TDD be applied to everything?

  13. Probably, no simple tasks, prototypes

  14. There are few techniques of writing tests

  15. Classic school Kent Beck, 90’s Inside-Out design Focusing on logic

    (algorithms)

  16. London school Jason Gorman, 00’s Outside-In design Focusing on collaboration

    Mocks

  17. What about integration tests?

  18. They are slow, hard to write, hard to setup… but

  19. … they usually caught most nasty bugs.

  20. None

  21. Maintaining test driven cycle

  22. None

  23. Acceptance test (PO communication) API (integration) tests Utils (units) tests

  24. Thanks, @alexbeletsky