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
2
330

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
Tweet

More Decks by Alexander Beletsky

See All by Alexander Beletsky
Snapshot Testing: Going beyond UI
Avatar for Alexander Beletsky alexbeletsky
1
690
Tech Culture in Startups
Avatar for Alexander Beletsky alexbeletsky
0
240
TDD in JavaScript
Avatar for Alexander Beletsky alexbeletsky
4
860
This is Node.js
Avatar for Alexander Beletsky alexbeletsky
10
450
Likeastore
Avatar for Alexander Beletsky alexbeletsky
3
140
PaaS in your pocker with Dokku
Avatar for Alexander Beletsky alexbeletsky
7
2.6k
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
620

Other Decks in Programming

See All in Programming
メッセージングを利用して時間的結合を分離しよう #phperkaigi
Avatar for Takuma Kajikawa kajitack
3
430
エンジニアの「手元の自動化」を加速するn8n 2026.02.27
Avatar for 西尾義英 symy2co
0
180
The free-lunch guide to idea circularity
Avatar for Holly Cummins hollycummins
0
370
Claude Codeログ基盤の構築
Avatar for giginet giginet
PRO
7
3.7k
ポーリング処理廃止によるイベント駆動アーキテクチャへの移行
Avatar for Seitaro Fujigaki seitarof
3
1.3k
AI Assistants for Your Angular Solutions @Angular Graz, March 2026
Avatar for Manfred Steyer manfredsteyer
PRO
0
110
AI Assistants for Your Angular Solutions
Avatar for Manfred Steyer manfredsteyer
PRO
0
160
ロボットのための工場に灯りは要らない
Avatar for watany watany
12
3.2k
今からFlash開発できるわけないじゃん、ムリムリ! (※ムリじゃなかった!?)
Avatar for Sora Arakawa arkw
0
160
Reactive ❤️ Loom: A Forbidden Love Story
Avatar for Francesco Nigro franz1981
2
170
Java 21/25 Virtual Threads 소개
Avatar for Sunghyouk Bae (Debop) debop
0
280
CSC307 Lecture 15
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
270

Featured

See All Featured
The AI Revolution Will Not Be Monopolized: How open-source beats economies of scale, even for LLMs
Avatar for Ines Montani inesmontani
PRO
3
3.2k
SEO Brein meetup: CTRL+C is not how to scale international SEO
Avatar for Linda Hogenes lindahogenes
1
2.5k
Understanding Cognitive Biases in Performance Measurement
Avatar for Philip Tellis bluesmoon
32
2.8k
The Curse of the Amulet
Avatar for Matthew Lei leimatthew05
1
11k
Why Your Marketing Sucks and What You Can Do About It - Sophie Logan
Avatar for Sophie Logan marketingsoph
0
120
The SEO identity crisis: Don't let AI make you average
Avatar for Varn varn
0
420
Effective software design: The role of men in debugging patriarchy in IT @ Voxxed Days AMS
Avatar for Kenny Baas-Schwegler baasie
0
270
Typedesign – Prime Four
Avatar for Hannes Fritz hannesfritz
42
3k
Joys of Absence: A Defence of Solitary Play
Avatar for Sebastian Deterding codingconduct
1
320
Six Lessons from altMBA
Avatar for Skipper Chong Warson skipperchong
29
4.2k
SERP Conf. Vienna - Web Accessibility: Optimizing for Inclusivity and SEO
Avatar for Sara Fernández Carmona sarafernandez
1
1.4k
Designing for Performance
Avatar for Lara Hogan lara
611
70k

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