Sandro Mancuso – Testing and refactoring legacy code @ I T.A.K.E. Unconference 2013, Bucharest

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Mozaic Works

Check out the video of the presentation: http://www.youtube.com/watch?v=WpKb1XqSiUs

Tecnologia Educação

Testing and Refactoring
Legacy Code
Sandro Mancuso
@sandromancuso
craftedsw.blogspot.com

Business Requirements
Imagine a social networking website for
travellers
• You need to be logged in to see the content
• You need to be a friend to see someone else’s
trips

Legacy Code Rules
• You cannot change production code if not
covered by tests
– Just automated refactoring (via IDE) is allowed, in
case it is needed for writing a test

Start refactoring from
deepest to shortest
branch
Start testing from
shortest to
deepest branch
Working with Legacy Code Tips

Trip Service - Problems
TripService
+findTripsByUser(User) : List<Trip>
<<Singleton>>
UserSession
+getInstance() : UserSession
+getLoggedUser() : User
TripDAO
+findTripsByUser(User) : List<Trip>

Craftsmen at work
• Write readable and maintainable code and tests
– Code must express business rules
• Strive for simplicity
• Know your tools well (i.e. frameworks, shortcuts)
• Work in small and safe increments
– Commit often
• Embrace changes, be brave
• Boy scout rule / No broken windows

Thanks
Sandro Mancuso
@sandromancuso
craftedsw.blogspot.com
https://github.com/sandromancuso/trip-service-kata
leanpub.com/socra

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