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Let's make this test suite run faster!
Let's make this test suite run faster!
               Why?




             What for ?




                                  http://farm1.static.flickr.com/158/349497988_fb751a5e3a_z.jpg
You test early and often
      Don’t you?




                           http://farm1.static.flickr.com/97/246816211_573c2901e1_z.jpg?zz=1
Continuous integration, continuous testing...
      ...even continuous deployment




                                      http://vator.tv/images/attachments/150609195630ctd.gif
Testing often
Often means waiting a lot




                            http://farm3.static.flickr.com/2505/3772118924_11fe195ef1.jpg
Your coding room doesn’t have to look like this




                  What for ?




                                        http://upload.wikimedia.org/wikipedia/commons/3/3f/
                                                                     Nespresso_boutique.JPG
Tests can be fast
Even if lines of code keep growing
Easy!
Let’s distribute across multiple hudson servers
It doesn’t have to be complicated
    I’ll share a few simple tricks
It can make your product better
Simple to test, means simple to write, deploy and USE




                                         Photo: http://www.flickr.com/photos/zoutedrop/2317065892/
How can we accelerate the tests?



     The Cheater
     The Lazy
     The Brave




                                   http://all-the-movies.cowblog.fr/images/arton1122.jpg
The Cheater
The Lazy
The Brave




              http://all-the-movies.cowblog.fr/images/arton1122.jpg
Buy a faster machine
Tests are cpu/memory bound




                         http://farm1.static.flickr.com/28/93569705_1c562b413a_z.jpg?zz=1
Be warned
Single threaded tests get slower over time


    100

     75

     50

     25

      0
          2007   2008   2009   2010




                                      http://farm5.static.flickr.com/4096/4819945812_735744e0fc_z.jpg
Use all the cores
parallel build with maven3




mvn -T1 clean install : 5:05s
mvn -T4 clean install : 3:10s
Use all the cores
parallel build with maven3
Use all the cores
For JUnit/TestNG tests




                         .
The Cheater
The Lazy
The Brave




              http://all-the-movies.cowblog.fr/images/arton1122.jpg
Delete redundant tests
It’s so simple, we don’t do it...




                               http://geekandpoke.typepad.com/geekandpoke/images/2008/04/24/
                                                                                turingtest.jpg
Even better, delete dead code
To delete yet other useless tests




                                http://farm1.static.flickr.com/58/191393602_3d9b643ab0_z.jpg
Work in a sandbox
       The network is too slow


     In-memory database: H2




Behaves more like MySql than Hsqldb
It’s Not only SQL




If going with NoSQL, take a server that
          can run in-process

            eg. Voldemort
In-memory SMTP Server
      Ethereal
Everything local and in-memory
              Files




Apache VFS (Virtual File System)
      Spring Resource...




                    As a bonus, tests will
                    run smoother
                                             .
The Cheater
The Lazy
The Brave




              http://all-the-movies.cowblog.fr/images/arton1122.jpg
Don’t test business rules in integration tests
      Unit tests is often a better place




                                        http://upload.wikimedia.org/wikipedia/commons/b/bd/
                                                              Contortionist_Ravi_standing.jpg
Don’t test business rules in integration tests
      Unit tests is often a better place
                     Functional test
                    (on a web page)
                          10s




                                             Unit test
                                              0.01s
Take the longer integration test
Break it in one faster integration test
    and a lot of small unit tests




                                   http://farm2.static.flickr.com/1168/3166709586_96f9a3fd95.jpg
Or mock the slowest layers
eg. functional test with Spring and Mockito
Or mock the slowest layers
eg. functional test with Spring and Mockito




                                       Mocks are
                                       not just for
                                        unit tests
Don’t test through the browser
  Selenium is often overkill

                 «But my application is
                      complex!»

               «My users want complex
                      features,
                My users want Ajax»

                 «I need to test browser
                     compatibility!»


                              Photo: http://www.flickr.com/photos/zoutedrop/2317065892/
Really ?




           http://i.zdnet.com/blogs/complexity-and-false-hope.jpg
Complexity has a cost
That you pay each time a test runs




                             http://thehongkongfixereng.files.wordpress.com/2008/07/couteau-suisse.jpg
Test through the browser the strict minimal
     Use javascript unit tests for the rest




                                   http://farm2.static.flickr.com/1168/3166709586_96f9a3fd95.jpg
I tend to be old school
And write server-side code most of the time




                                     http://www.celebridiot.com/wp-content/uploads/2009/06/
                                                                  rick_astley_death_hoax.jpg
One more thing...




Simplify and optimize your code

      Tests will run faster




                                  .
Thank you
   Q/A
Who am I?



        David Gageot

      CTO algodeal.com
      The Crowd Sourced
      Quant Hedge Fund

              @dgageot
            javabien.net

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Let's make this test suite run faster! SoftShake 2010

  • 1. Let's make this test suite run faster!
  • 2. Let's make this test suite run faster! Why? What for ? http://farm1.static.flickr.com/158/349497988_fb751a5e3a_z.jpg
  • 3. You test early and often Don’t you? http://farm1.static.flickr.com/97/246816211_573c2901e1_z.jpg?zz=1
  • 4. Continuous integration, continuous testing... ...even continuous deployment http://vator.tv/images/attachments/150609195630ctd.gif
  • 5. Testing often Often means waiting a lot http://farm3.static.flickr.com/2505/3772118924_11fe195ef1.jpg
  • 6. Your coding room doesn’t have to look like this What for ? http://upload.wikimedia.org/wikipedia/commons/3/3f/ Nespresso_boutique.JPG
  • 7. Tests can be fast Even if lines of code keep growing
  • 8. Easy! Let’s distribute across multiple hudson servers
  • 9. It doesn’t have to be complicated I’ll share a few simple tricks
  • 10. It can make your product better Simple to test, means simple to write, deploy and USE Photo: http://www.flickr.com/photos/zoutedrop/2317065892/
  • 11. How can we accelerate the tests? The Cheater The Lazy The Brave http://all-the-movies.cowblog.fr/images/arton1122.jpg
  • 12. The Cheater The Lazy The Brave http://all-the-movies.cowblog.fr/images/arton1122.jpg
  • 13. Buy a faster machine Tests are cpu/memory bound http://farm1.static.flickr.com/28/93569705_1c562b413a_z.jpg?zz=1
  • 14. Be warned Single threaded tests get slower over time 100 75 50 25 0 2007 2008 2009 2010 http://farm5.static.flickr.com/4096/4819945812_735744e0fc_z.jpg
  • 15. Use all the cores parallel build with maven3 mvn -T1 clean install : 5:05s mvn -T4 clean install : 3:10s
  • 16. Use all the cores parallel build with maven3
  • 17. Use all the cores For JUnit/TestNG tests .
  • 18. The Cheater The Lazy The Brave http://all-the-movies.cowblog.fr/images/arton1122.jpg
  • 19. Delete redundant tests It’s so simple, we don’t do it... http://geekandpoke.typepad.com/geekandpoke/images/2008/04/24/ turingtest.jpg
  • 20. Even better, delete dead code To delete yet other useless tests http://farm1.static.flickr.com/58/191393602_3d9b643ab0_z.jpg
  • 21. Work in a sandbox The network is too slow In-memory database: H2 Behaves more like MySql than Hsqldb
  • 22. It’s Not only SQL If going with NoSQL, take a server that can run in-process eg. Voldemort
  • 24. Everything local and in-memory Files Apache VFS (Virtual File System) Spring Resource... As a bonus, tests will run smoother .
  • 25. The Cheater The Lazy The Brave http://all-the-movies.cowblog.fr/images/arton1122.jpg
  • 26. Don’t test business rules in integration tests Unit tests is often a better place http://upload.wikimedia.org/wikipedia/commons/b/bd/ Contortionist_Ravi_standing.jpg
  • 27. Don’t test business rules in integration tests Unit tests is often a better place Functional test (on a web page) 10s Unit test 0.01s
  • 28. Take the longer integration test Break it in one faster integration test and a lot of small unit tests http://farm2.static.flickr.com/1168/3166709586_96f9a3fd95.jpg
  • 29. Or mock the slowest layers eg. functional test with Spring and Mockito
  • 30. Or mock the slowest layers eg. functional test with Spring and Mockito Mocks are not just for unit tests
  • 31. Don’t test through the browser Selenium is often overkill «But my application is complex!» «My users want complex features, My users want Ajax» «I need to test browser compatibility!» Photo: http://www.flickr.com/photos/zoutedrop/2317065892/
  • 32. Really ? http://i.zdnet.com/blogs/complexity-and-false-hope.jpg
  • 33. Complexity has a cost That you pay each time a test runs http://thehongkongfixereng.files.wordpress.com/2008/07/couteau-suisse.jpg
  • 34. Test through the browser the strict minimal Use javascript unit tests for the rest http://farm2.static.flickr.com/1168/3166709586_96f9a3fd95.jpg
  • 35. I tend to be old school And write server-side code most of the time http://www.celebridiot.com/wp-content/uploads/2009/06/ rick_astley_death_hoax.jpg
  • 36. One more thing... Simplify and optimize your code Tests will run faster .
  • 37. Thank you Q/A
  • 38. Who am I? David Gageot CTO algodeal.com The Crowd Sourced Quant Hedge Fund @dgageot javabien.net