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Scrivere codice pulito che funzioni.Pur sembrando un'apparente contraddizione che si cela nelle difficoltà della programmazione,lo sviluppo guidato dai test risponde a questa sfida con un paradosso:scrivere test prima dell'implementazione. Lo sviluppo software guidato dai test è una pratica della metodologia Agile che elimina le paure nella scrittura di codice e porta gli sviluppatori ad incrementare drasticamente la qualità delle loro applicazioni. Durante il talk verrà mostrato come l'approccio alla pratica cambi il proprio modo di programmare,rendendolo più divertente,affidabile e proficuo.
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David Funaro
Let’s test!
Andrea Giuliano
#code10 #letstest
Let’s test!
“Come ho fatto fino ad ora a lavorare senza test?”
“Non tornerei mai più indietro!”
Let’s test!
I manually test allmy code’s functionalities
write code features
Let’s test!
How (most) developerswrite code today
my starting project
Let’s test!
CHANGES
Let’s test!
internal external
be honest...
Let’s test!
Contents...
Let’s test!
I’m looking forward to waste my code
Contents...
Let’s test!
What happens when something goes wrong
Contents...
Let’s test!
Where can I putmy hands in?
Contents...
Let’s test!
one more patch
I’ve got the solution!
Contents...
Let’s test!
I madesome mistakes
NO FEEDBACK
Let’s test!
? ????
??
I’m hopeless
Contents...
Let’s test!
I want to be proudof my code
Contents...
Let’s test!
Automatic Test
Let’s test!
Why automatic tests?
Let’s test!
confidence in your code
progressive input growth
no feartests as documentation easier to alter code
understand HOW code works
working software over comprehensive documentation
easy to rundon’t waste your time
feedback
How many kinds of test exists?Unit
FunctionalIntegration
more...
Let’s test!
we want short feedback!
Let’s test!
stress =1
# tests
Let’s test!
Ok, let’s try!I want to write a test for my code
Let’s test!
Contents...
Let’s test!
Sounds good......but one day
Contents...
Let’s test!
How can I test this?coupling dependencies
Let’s test!
I don’t now so I DON’T test
Clean code that works cit. Ron Jeffries
predictable way to developlearn all of the lessons that the code has to teach you
improve the lives of the users of your softwarelet your teammates count on you, and you on them
feel good to write code
Let’s test!
How do we get to clean code that works?
Many forces drive us away from clean codeand even from clean code that works
Let’s test!
Test Driven Development
Let’s test!
Test-driven development is less and more writing test first...but TDD is about design
Test-driven development is a way of managing fear during programming
our tasks
Red: write a little test that doesn’t work
Green: make the test work quickly
Refactor: eliminate all the duplication created in merely getting the test to work
feature #1feature #2feature #3
Let’s test!
Let’s test!
write a test
Let’s test!
write a testit fails!
Let’s test!
write a test
make it works
it fails!
Let’s test!
write a test
make it works
it fails!awesomeit’s green!
Let’s test!
write a test
make it works
do refactor
it fails!awesomeit’s green!
Let’s test!
write a test
make it works
do refactor
it fails!awesomeit’s green!
what are the benefits?
improve quality of your codebehaviours’ verification
coverage functionalitytest as documentation
long term maintainabilityvery short time feedback about bugs
collaborative working
QA from reactive to proactive
Let’s test!
ok, it’s cool but my resources are limited
I want to be cheap
I want to be fast
I want to be good
Let’s test!
What about legacy code?
Test new functionalities
Test old functionalities starting from bugs
Let’s test!
DEMO
Let’s test!
Thanks!
Andrea Giuliano@bit_sharkandreagiuliano.it
David Funaro@ingdavidinodavidfunaro.com
Questions?
Let’s test!
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