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

Testing value objects

Avatar for Fran Iglesias Fran Iglesias
November 02, 2018
Programming
0
220

Testing value objects

How to test things like immutability

Avatar for Fran Iglesias

Fran Iglesias

November 02, 2018
Tweet

More Decks by Fran Iglesias

See All by Fran Iglesias
Tips for daily refactoring
Avatar for Fran Iglesias franiglesias
0
320
Introduction to TDD: Red-Green-Refactor
Avatar for Fran Iglesias franiglesias
1
240
testing the unpredictable
Avatar for Fran Iglesias franiglesias
0
190
Tests doubles: the motion picture
Avatar for Fran Iglesias franiglesias
0
450
Low cost techniques for test doubles
Avatar for Fran Iglesias franiglesias
0
170

Other Decks in Programming

See All in Programming
Jakarta EE Core Profile and Helidon - Speed, Simplicity, and AI Integration
Avatar for ivargrimstad ivargrimstad
0
230
testingを眺める
Avatar for matumoto matumoto
1
120
MCPで実現するAIエージェント駆動のNext.jsアプリデバッグ手法
Avatar for NakamuraTakumi nyatinte
7
960
実用的なGOCACHEPROG実装をするために / golang.tokyo #40
Avatar for mazrean mazrean
1
110
Rancher と Terraform
Avatar for Ryoma Fujiwara fufuhu
1
130
あのころの iPod を どうにか再生させたい
Avatar for orumin orumin
2
2.5k
為你自己學 Python - 冷知識篇
Avatar for 高見龍 eddie
1
280
Vue・React マルチプロダクト開発を支える Vite
Avatar for ANDPAD inc andpad
0
100
Flutter로 Gemini와 MCP를 활용한 Agentic App 만들기 - 박제창 2025 I/O Extended Seoul
Avatar for JaiChangPark itsmedreamwalker
0
150
ソフトウェアテスト徹底指南書の紹介
Avatar for Hiroki Iseri goyoki
1
120
Infer入門
Avatar for r1ru riru
4
1.6k
🔨 小さなビルドシステムを作る
Avatar for Mutsuha Asada momeemt
2
600

Featured

See All Featured
Design and Strategy: How to Deal with People Who Don’t "Get" Design
Avatar for Morgane Peng morganepeng
131
19k
The Pragmatic Product Professional
Avatar for Laura Van Doore lauravandoore
36
6.8k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
Avatar for Tammy Everts tammyeverts
8
490
Docker and Python
Avatar for Tania Allard trallard
45
3.5k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
Avatar for Eileen M. Uchitelle eileencodes
139
34k
ReactJS: Keep Simple. Everything can be a component!
Avatar for Pedro Nauck pedronauck
667
120k
Art, The Web, and Tiny UX
Avatar for Lynn Fisher lynnandtonic
302
21k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
Avatar for Addy Osmani addyosmani
7
830
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
Avatar for Irina Nazarova irinanazarova
8
900
Embracing the Ebb and Flow
Avatar for Simon Collison colly
87
4.8k
JavaScript: Past, Present, and Future - NDC Porto 2020
Avatar for David Neal reverentgeek
51
5.5k
Raft: Consensus for Rubyists
Avatar for Patrick Van Stee vanstee
140
7.1k

Transcript

  1. TDD 101 2. TDDing Value Objects

  2. TDDing Value Objects

  3. Value Object (DDD) Small object Represents a concept Equality based

    on value Immutable: • Should be created consistent • Mutators should return new instances

  4. So… How do you TDD a VO?

  5. TDD VO Think of an invalid example Write a test

    that fails expecting exception Make the test pass Repeat as needed to test invalid cases

  6. TDD VO Think of a valid example Write a test

    that fails asserting value Make the test pass

  7. TDD VO Equality Write a test that fails expecting inequality

    Make the test pass Then write a test that fails expecting equality Make the test pass

  8. TDD VO Immutability Think of a valid example of a

    mutator Write a test that fails expecting a different instance Make the test pass
  9. None