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Lavorare con codice
legacy “non testabile”
Andrea Francia (7Pixel)

8 marzo 2019 @ Incontro DevOps (Bologna)
Perché testare il
legacy?
@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
“non testabile” ?
“non testabile”
—>
difficile da testare
unit test (Feathers’ definition)
A test that runs in less than 1/10th of
a second and is small enough to help
you localize problems when it fails.
Some of the worst enemies
of Unit Tests
• The Database

• The Network

• The random numbers

• Thread

• The MVC framework
Fast Feedback -> Faster learning
@andreafrancia
Il problema sono le
dipendenze
TripService)
+findTripsByUser(User)0:0List<Trip>0
<<Singleton>>)
UserSession)
+getInstance()0:0UserSession0
+getLoggedUser()0:0User0
TripDAO)
+findTripsByUser(User)0:0List<Trip>0
http://www.slideshare.net/MozaicWorks/sandro-mancuso-testing-and-refactoring-legacy-code/7
@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
@andreafrancia
Social Network per
Viaggiatori
• Requisiti:
• Solo gli utenti loggati possono per vedere i
contenuti del sito.
• Puoi vedere i viaggi degli altri utenti che sono
tuoi “amici”
@andreafrancia
Dipendenze
TripService)
+findTripsByUser(User)0:0List<Trip>0
<<Singleton>>)
UserSession)
+getInstance()0:0UserSession0
+getLoggedUser()0:0User0
TripDAO)
+findTripsByUser(User)0:0List<Trip>0
http://www.slideshare.net/MozaicWorks/sandro-mancuso-testing-and-refactoring-legacy-code/7
@andreafrancia
Dipendenze
TripService)
+findTripsByUser(User)0:0List<Trip>0
<<Singleton>>)
UserSession)
+getInstance()0:0UserSession0
+getLoggedUser()0:0User0
TripDAO)
+findTripsByUser(User)0:0List<Trip>0
http://www.slideshare.net/MozaicWorks/sandro-mancuso-testing-and-refactoring-legacy-code/7
@andreafrancia
The Legacy Code Dilemma
When we refactor, we should have tests.
To put tests in place, we often have to refactor
@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
Working with Legacy Code
Tips
Use a coverage tool
Coverage in PHPUnit
@andreafrancia
Seam
“A seam is a place where you can alter
behavior in your program without
editing in that place”
@andreafrancia
Enabling Point
“Every seam has an enabling point, a
place where you can make the decision
to use one behavior or another.”
@andreafrancia
Grazie

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Lavorare con codice legacy “non testabile” - Incontro DevOps - 8 marzo 2019 - Bologna