Skip to Content
Author's profile photo Damir Majer

Have fun with ABAP Koans

ABAP Koans

Why practicing is better than theory?


By designing you learn to design. By making programs you learn to make programs. wiki.c2

Are you trying to master a new language or level up with the one you already familiar with?
Koans are a great way to hone your skills through small exercises.

The first Koans exercises are created by Jim Weirich for learning the Programming Language Ruby. Ruby Koans

The Koans walk you along the path to enlightenment in order to learn Ruby. The goal is to learn the Ruby language, syntax, structure, and some common functions and libraries. We also teach you culture. Testing is not just something we pay lip service to, but something we live. It is essential in your quest to learn and do great things in the language.

Koans aren´t limited to learning a Language. I´d like the concept of Carlos Ble´s to use the Koans for learning Unit-Testing in JavaScript jskoans.

I adapted this idea and wrote the first ABAP Koans to explore the ABAP Unit Testing Framework. It should be a small step to motivate YOU to start exploring Unit Tests in ABAP.
(System Requirement minimum 7.40)

Essentially ABAP Koans is an interactive tutorial.
You clone the GitHub repository navigate to the existing global class and execute the Unit Tests over Menu >Execute>Unit Test or via the Keyboard Shortcut CTRL+SHIFT+F10 (works also in ABAP in Eclipse ;-).

You start with a failing Unit Test.

Solve them and continue to the next failing Test, until you solve every failing Unit Test.

No previous knowledge is required. The first Tests are very basic, but feel free to extend the current standing!

Assigned Tags

      You must be Logged on to comment or reply to a post.
      Author's profile photo Jelena Perfiljeva
      Jelena Perfiljeva

      Hm, interesting idea... Unfortunately, I'm disqualified by not having 7.4. 🙁

      For those who are also wondering what the heck is "koan":

      Author's profile photo Michelle Crapo
      Michelle Crapo

      Jelena Perfiljeva

      I have the same problem - no access to 7.4.   Thank you for the definition!

      Damir Majer

      Thank you for an interesting blog and creating the unit test koans.


      Author's profile photo Damir Majer
      Damir Majer
      Blog Post Author

      Hi Former Member and Jelena Perfiljeva ,

      I´ve just created a Version for Systems with ABAP Stack between 7.02 and 7.31. (I made the changes without a proper System, please give me some Feedback if it works on your Systems...)

      Installation is pretty forward using abapgit:

      1. Clone the Repository
      2. Select the branch '7.02-7.31'
      3. Press ok

      That´s all!

      Have fun to explore ABAP Unit.



      Author's profile photo Michelle Crapo
      Michelle Crapo

      That was so nice of you to do.

      Thank you!


      Author's profile photo Julie Plummer
      Julie Plummer
      • Thanks Damir – both for the Koans and the “downport”.

      *Shameless plug alert:* For those who want to try the original 750 version:


      have fun!


      Author's profile photo Damir Majer
      Damir Majer
      Blog Post Author

      Hi Jelena Perfiljeva,

      thanks for the addition! Hmh, I don´t have an access to a system lower than 7.4 but I will think to add a branch for those Requirements!



      Author's profile photo Matt Fraser
      Matt Fraser

      Love the graphic! Reminds me of the famous "Ten Bulls" woodcut from 12th-century Chinese Zen (or Chan) Buddhism, which I'm pretty sure could be adapted to the process of mastering the art of design!

      Image result for ten bulls

      Author's profile photo Damir Majer
      Damir Majer
      Blog Post Author

      Matt Fraser hehe, I love your graphic too 😉

      Reminds me of the Book Zen Programmer...




      Author's profile photo Matt Fraser
      Matt Fraser

      That's awesome! I didn't know that book. The blurb reminds me of my own old blog post, Banishing Basis Burnout. And of course another one I wrote: Zen and the Art of Unlearning Expertise, though that one wasn't about stress and burnout so much.


      Author's profile photo Paul Hardy
      Paul Hardy

      This is all about UNIT TESTING as well, so gets my vote.

      The Australian development system where I work is on 7.50 (up from 7.02) as about fifteen minutes ago, so we are good to go. Germany (where I am) will be about three months behind, and I will push this here as well, purely from the UT perspective.

      SAP as a company should note how few people (customer systems) actually are on a 7.40 system or above. It is far less than anyone imagines....


      Author's profile photo Robert Forster
      Robert Forster


      agree - glad we are on 7.4.

      11500 according to the TechEd slides


      Author's profile photo Robert Forster
      Robert Forster


      sorry wrong link - and stuck in unable to update bug


      Author's profile photo Timo John
      Timo John


      I like the idea very much with point of view to teach trainees in ABAP

      Author's profile photo Shivam Shukla
      Shivam Shukla

      Hi ,

      Can you please explain the benefit to the developer as I didn’t get exactly where i can get the benefit of during abap development.


      thanks ,



      Author's profile photo Sergio Fraga
      Sergio Fraga


      Thanks for another great initiative Damir Majer !

      A great way of keeping up the pace after atending an ABAP Code Retreat!!

      Keep up the nice work


      Sérgio Fraga



      Author's profile photo Flavio Furlan
      Flavio Furlan

      Hi, it's REALLY nice idea!

      Some time ago we published a book of exercises in ABAP, 101 Exercises in ABAP (, because we (me and Fabio Pagoti ) also believe that "practicing is better than theory".

      Nice job bringing that to ABAP!


      Author's profile photo Jakob Marius Kjær
      Jakob Marius Kjær

      Jelena Perfiljeva  and Former Member you could always install the nwabap trial. For example on a docker instance  ?

      Author's profile photo Joachim Rees
      Joachim Rees

      After having found recently (via a comment on ), I remembered at least the title of this blog and went searching for it.

      Cloning didn't work (HTTP-Error 407), but I worked around it with import *.zip. (Another thing  I can give praise to OpenSap WTC1: it made me install and use ABAPgit for the first time, lowering the bar of "unknown, thus uncomfortable" for all future cases where I come across it!).


      So I did about 12 of those Koans.

      What threw me off at first, is that it's not about the production code at all; thw whole reason of those unit tests existing is them failing (or later: passing), nothing else....


      I can see that such a setup is a possible way of learning/exploring a new topic (here: what methods does cl_abap_unit_assert have, and how are they used).



      Author's profile photo Joachim Rees
      Joachim Rees

      I today did the rest of them, and now understand, that it's actually not about unit testing. Instead the ABAPunit-framework is used to learn whatever the Koan is designed to teach (e.g. regular expressions)

      Would be interesting to see more of those Koans!
      And yes, it is fun! 🙂