Test-Driven Development su Codice Esistente
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This document discusses test-driven development (TDD) approaches for refactoring legacy code. It notes that refactoring legacy code is challenging because tests often need to be added before refactoring can be done safely. It also references a "Trip Service Kata" example for demonstrating TDD and refactoring of legacy code. Finally, it provides some tips for working with legacy code, such as starting refactoring from the deepest code branches and starting testing from the shallowest branches.
Test-Driven Development su Codice Esistente
- 1. @andreafrancia Test-Driven Development su Codice Esistente Andrea Francia 5 aprile 2018 @ Crafted Software Milano
- 2. @andreafrancia The conservative approach No automatic tests leads to Manual testing that leads to High risk of introduce bugs that leads to Fear of change so You prefer add more mess instead cleaning up the existing code and the code get worse, the cost/time of adding features increases If it ain't broke don't fix it
- 3. @andreafrancia The Legacy Code Dilemma When we refactor, we should have tests. To put tests in place, we often have to refactor
- 4. @andreafrancia Trip Service Kata • Sandro Mancuso (@sandromancuso) • https://github.com/sandromancuso/trip-service- kata • http://www.slideshare.net/MozaicWorks/sandro- mancuso-testing-and-refactoring-legacy-code
- 5. @andreafrancia Requisiti di business Considerate un social network per viaggiatori. • Devi essere loggato per vedere i contenuti del sito. • Devi essere un amico per poter vedere i viaggi di un altro utente.
- 6. @andreafrancia Le regole del legacy code • Puoi modificare solo il codice di produzione che è coperto dai test • (al massimo puoi usare solo i safe refactoring nel caso siano necessari per mettere il codice sotto test)
- 8. @andreafrancia Start refactoring from deepest to shortest branch Start tes3ng from shortest to deepest branch Working with Legacy Code Tips This slide is taken from a Sandro Mancuso Slideshare: https://www.slideshare.net/sandromancuso/legacy-code-handson-session/7