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
320

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
680
Tech Culture in Startups
Avatar for Alexander Beletsky alexbeletsky
0
230
TDD in JavaScript
Avatar for Alexander Beletsky alexbeletsky
4
850
This is Node.js
Avatar for Alexander Beletsky alexbeletsky
10
440
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
5.4k
.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
.NET Conf 2025 の興味のあるセッ ションを復習した / dotnet conf 2025 quick recap for backend engineer
Avatar for Tomohisa Takaoka tomohisa
0
110
從冷知識到漏洞，你不懂的 Web，駭客懂 - Huli @ WebConf Taiwan 2025
Avatar for Huli aszx87410
2
3.4k
Unicodeどうしてる？ PHPから見たUnicode対応と他言語での対応についてのお伺い
Avatar for てきめん tekimen youkidearitai
PRO
0
580
dchart: charts from deck markup
Avatar for Anthony Starks ajstarks
3
960
DevFest Android in Korea 2025 - 개발자 커뮤니티를 통해 얻는 가치
Avatar for Suhyeon Kim wisemuji
0
180
HTTPプロトコル正しく理解していますか？ 〜かわいい猫と共に学ぼう。ฅ^•ω•^ฅ ﾆｬ〜
Avatar for ♛Heitor Hirose hekuchan
2
640
Denoのセキュリティに関する仕組みの紹介 (toranoana.deno #23)
Avatar for uki00a uki00a
0
230
なぜSQLはAIぽく見えるのか/why does SQL look AI like
Avatar for florets1 florets1
0
260
CSC307 Lecture 04
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
640
Implementation Patterns
Avatar for Denys Poltorak denyspoltorak
0
170
Deno Tunnel を使ってみた話
Avatar for すずとも kamekyame
0
330
今こそ知るべき耐量子計算機暗号(PQC)入門 / PQC: What You Need to Know Now
Avatar for mackey0225 mackey0225
3
320

Featured

See All Featured
Game over? The fight for quality and originality in the time of robots
Avatar for Wayne Barker wayneb77
1
82
The Hidden Cost of Media on the Web [PixelPalooza 2025]
Avatar for Tammy Everts tammyeverts
2
140
Getting science done with accelerated Python computing platforms
Avatar for Jacob Tomlinson jacobtomlinson
1
98
Fashionably flexible responsive web design (full day workshop)
Avatar for Andy Clarke malarkey
408
66k
Navigating Weather and Climate Data
Avatar for Ryan Abernathey rabernat
0
72
Future Trends and Review - Lecture 12 - Web Technologies (1019888BNR)
Avatar for Beat Signer signer
PRO
0
3.2k
Design in an AI World
Avatar for tapps tapps
0
120
How to Grow Your eCommerce with AI & Automation
Avatar for Katarina Dahlin katarinadahlin
PRO
0
89
Have SEOs Ruined the Internet? - User Awareness of SEO in 2025
Avatar for Akash Hashmi akashhashmi
0
240
Code Reviewing Like a Champion
Avatar for maltzj maltzj
527
40k
Build your cross-platform service in a week with App Engine
Avatar for Jose L jlugia
234
18k
Jamie Indigo - Trashchat’s Guide to Black Boxes: Technical SEO Tactics for LLMs
Avatar for Tech SEO Connect techseoconnect
PRO
0
42

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