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Andrea Giuliano
David Funaro
Let’s test!



      #code10 #letstest
Let’s test!




“Come ho fatto fino ad ora a lavorare senza test?”



        “Non tornerei mai più indietro!”
Let’s test!


  write code features




   I manually test all
my code’s functionalities
Let’s test!




How (most) developers
  write code today
Let’s test!


   my starting project
Let’s test!




            CHANGES


internal          external
Let’s test!




              be honest...
Let’s test!



Contents...


   I’m looking forward
     to waste my code
Let’s test!



Contents...




    What happens when
   something goes wrong
Let’s test!



Contents...




Where can I put
my hands in?
Let’s test!



Contents...    I’ve got the
                solution!



                            one more patch
Let’s test!




          I made
Contents...

       some mistakes



                            NO FEEDBACK
Let’s test!




         ?                ?   ?
?
                      ?
    ?
             ?
I’m hopeless
Let’s test!



Contents...




      I want to be proud
          of my code
Let’s test!



Contents...




                 Automatic Test
Let’s test!
Let’s test!



      Why automatic tests?
                  progressive input growth

  tests as documentation
                                     easier to alter code
                           no fear
     feedback              understand HOW code works
    easy to run                  confidence in your code
don’t waste your time
working software over comprehensive documentation
Let’s test!



How many kinds of test exists?
                        Unit

           Functional
                             Integration
                   more...
Let’s test!



we want short feedback!
Let’s test!




                1
    stress =
             # tests
Let’s test!




Ok, let’s try!
I want to write a test for my code
Let’s test!




        Sounds good...
Contents...

        ...but one day
Let’s test!



Contents...



  How can I test this?
         coupling           dependencies
Let’s test!




        I don’t now so I DON’T test
Let’s test!



Clean code that works                     cit. Ron Jeffries



 predictable way to develop
                   learn all of the lessons that the code has to teach you
            improve the lives of the users of your software
                                   let 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 code
 and even from clean code that works
Let’s test!



Test Driven Development

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
Let’s test!



our tasks                                                 feature #1
                                                          feature #2
                                                          feature #3

 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
Let’s test!




        write a test
Let’s test!




it fails!           write a test
Let’s test!




it fails!           write a test

                  make it works
Let’s test!




it fails!           write a test
                                   awesome
                  make it works
                                   it’s green!
Let’s test!




it fails!           write a test
                                   awesome
                  make it works
                                   it’s green!

                    do refactor
Let’s test!




it fails!           write a test
                                   awesome
                  make it works
                                   it’s green!

                    do refactor
Let’s test!



            what are the benefits?
improve quality of your code
                                    behaviours’ verification
 coverage functionality
                          test as documentation          collaborative working
        long term maintainability
                          very short time feedback about bugs


                           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!
                   Questions?
Andrea Giuliano                   David Funaro
@bit_shark                        @ingdavidino
andreagiuliano.it                 davidfunaro.com

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Let's test! @ codemotion 23/03/2013