ArchUnit is a testing tool that integrates with JUnit to test software architectures. It provides a fluent API to define rules to check architecture compliance as code is developed and maintained. Rules can check for things like layer dependencies, class and method naming conventions, and common code smells. ArchUnit runs the defined rules and reports any violations found to help maintain architecture integrity over time.

1. Using ArchUnit to
test your architecture
Matt Ho

2. About me
- Hi, I'm Matt 👋
- 松凌科技 Architect / R&D
- JCConf Speaker
- methodho@gmail.com
- https://github.com/shihyuho

3. 放⼼, 這不是在講架構

4. 本節在分享
架構已經在那了 &&
該如何確保在持續開發/維運的過程中, 應⽤程式仍
然遵循著架構走

5. https://www.archunit.org/

6. ArchUnit Overview
- 是⼀個測試套件, 整合了 JUnit 4, JUnit 5 等
- 良好的 Fluent API
- 容易延伸擴充
- Apache-2.0 license

7. 運作過程

8. 起⼿式
決定從哪邊開始匯入 bytecodes

9. 起⼿式
定義 Rules

10. 起⼿式
ArchUnit 執⾏得到結果

11. 起⼿式 - Rule Pattern
ArchRuleDefinition.GIVEN_OBJECTS
.that(). PREDICATE
.should(). CONDITION

12. Controller 命名必須以 ‘Controller’ 結尾
Class Naming

13. Controller 命名必須以 ‘Controller’ 結尾
Class Naming

14. Class Naming
Controller 命名必須以 ‘Controller’ 結尾

15. Class Naming
Data Access 命名必須以 ‘Dao’ 結尾

16. Class Naming
Data Access 命名必須以 ‘Dao’ 結尾

17. Class Naming
Data Access 命名必須以 ‘Dao’ 結尾

18. Layered

19. Layered

20. Layered

21. Layered

22. Layered
Architectures.layeredArchitecture()
.layer(). PREDICATE
.whereLayer(). CONDITION

23. Layered
定義 3 層 layer
定義依賴關係

24. General

25. Freeze
- 套⽤在舊的系統中, 超多條違規改不動 ;-(

26. Freeze
- 套⽤在舊的系統中, 超多條違規改不動 ;-(
- 好吧, 那就現在開始的程式才檢查 :-)

27. Freeze
- 套⽤在舊的系統中, 超多條違規改不動 ;-(
- 好吧, 那就現在開始的程式才檢查 :-)
FreezingArchRule.freeze(
ArchRuleDefinition.GIVEN_OBJECTS
.that(). PREDICATE
.should(). CONDITION
)

28. Freeze

29. Code Smells

30. Long Parameter List
https://refactoring.guru/smells/long-parameter-list

31. Large Class
https://refactoring.guru/smells/large-class

32. Long Method
https://refactoring.guru/smells/long-method

33. Recap
- 起⼿式
- Naming Rules
- Layers Rules
- General Rules
- Freezing Rules
- Custom Rules - Code Smells

34. Thank you 🙌