Unit vs. Integration Tests
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The document discusses the differences between unit tests and integration tests, presenting a comprehensive comparison that includes the advantages and challenges of each approach. It also introduces concepts such as the test pyramid, the role of acceptance tests, and the need for both isolated and integrated testing strategies in projects. The meetup includes a workshop aimed at sharing experiences and improving testing practices among participants.
Unit vs. Integration Tests
- 1. Unit vs. Integration Tests Softwerkskammer Meetup Munich @codecentric 18.06.2015 David Völkel @davidvoelkel
- 2. Unit vs. Integrated Tests Isolated integratedvs.
- 3. Which do you prefer? Isolated Integrated 1 2 3 4 5
- 4. Agenda ● Theory ● Unit vs. Integration Tests ● Test Pyramid ● How to achieve it ● Workshop ● What works well in our projects? ● Hardest challenges? ● How to address them? ● Another beer
- 5. Expensive Integrated Tests Isolated Integrated Creation & Maintenance cheap expensive Feedback fast slow Finding Errors easy difficult Fragility minimal high Significance for User medium high 4 n + m n * m
- 6. Unit under test? Isolated Integrated Strengths Complex logic („combinatorial explosion“), conditionals, breadth Integration, data flow, depth
- 8. No: Test Pyramids!?! By Mike Cohn
- 9. ? ? Unit
- 10. Orthogonal decomposition By Mike Cohn . IntegratedTests Isolated Tests &
- 11. Business Dimension Acceptance Tests == UI-Tests? Inspired through "the testing iceberg“ by Seb Rose / Matt Wynne Acceptance Tests Technical Tests Business Domain DegreeofIntegration .
- 12. Split up Acceptance Tests Acceptance Tests UI Domain Rules
- 13. Example Email Validation N x integrated web tests Input Output „valid@email.de“ „Email OK“ „mail.without@tld“ „Email invalid“ „mail.without.at.de“ „Email invalid“ „@without-user.de“ „Email invalid“ … valid
- 14. Example Email Validation 1 x integrated web tests N x isolated tests valid Input Output „valid@email.de“ „Email OK“ „mail.without@tld“ „Email invalid“ „mail.without.at.de“ „Email invalid“ „@without-user.de“ „Email invalid“ …
- 15. UI Test Pyramid UI Test != End2End Tests E2E Compo nent Unit DegreeofIntegration
- 16. (UI) End2End Tests Fully integrated down to the backend for • backend interaction • few logic (CRUD) • simple workflows • hardly testable legacy UI E2E Compo nent Unit Back- end
- 18. UI-Layer component test ● testability required ● fat client ● SPA + REST ● server-side rendering? E2E Compo nent Unit UI Mock Back end
- 19. UI-Layer for • session status • complex UI workflows • workflows with few backend- interaktion E2E Compo nent Unit UI Mock Back end
- 21. UI Unit Tests for complex logic value rendering MVP: Presenter logic Address example: „D-80687, München, Elsenheimerstraße 55a“ „-, München, Elsenheimerstraße 55a“? E2E Compo nent Unit UI
- 22. Resumee UI Service Unit Test Pyramid • Integrated Tests: Integration & Depth • Isolierte Tests: Logic & Breadth Orthogonal Decomposition • Split up Acceptance Tests • Business Rules • UI • E2E, UI Layer, UI Unit Tests
- 23. Workshop Agenda ● Round 1: current state in your project ● Successful solutions? ● Hardest challenges? ● Show & tell ● Round 2 ● how can we improve? ● Show & tell ● Retrospective
- 24. Retrospective
- 25. License Creative Commons Attribution-ShareAlike 3.0 https://creativecommons.org/licenses/by-sa/3.0/de/