Quo pertentas, OSS? – How Open Source can benefit from well-crafted Tests

 This talk illustrates how a suite of well-written tests can benefit any Open Source project on multiple levels*: 

  • improve maintainability of the code-base
  • help increase the truck factor** of the project
  • “after-the-fact” tests help understand existing code and serve as documentation
  • Behavior Driven Development (BDD) concepts can help create specification-like tests

The idea of adding BDD-style unit tests was introduced into the actively developed OWASP ZAP project end of 2012. It will be explained 

  • how the ZAP team approached this task initially
  • what the improvements for the project were so far
  • where we are going with automated testing in the future

Disclaimer: Some source code will definetely be shown during this talk, but you won’t need to be a Java expert to follow the story! Having some general programming experience is totally sufficient! 

*= surprisingly also works for proprietary software projects! 
**= number of contributors that could be (fatally) run over by a truck without effectively killing the project

Practicing Advanced Unit Testing with the TCG Kata

Doing Code Katas alone or in a Dojo can help sharpen our elementary skills as software developers. Practicing IDE shortcuts and TDD mini-step cycles is very useful for the daily business, yet I find some existing Code Katas too far away from real-life programming situations. That’s why I came up with the Trading Card Game Kata – which is (very loosely) based on Blizzard Entertainment’s free-to-play online-game “Hearthstone – Heroes of Warcraft”. This Kata is focused on practicing TDD in a slightly more complex (but not complicated) situation where you might have to think about rules like Single Responsibility Principle or Command Query Separation and might even feel the urge to use a Mocking framework at some point.

First I will introduce the ideas of Katas and Dojos in general and explain the TCG Kata rules to you. Then I will demo some real-life best-practices for writing good developer tests, using my TCG Kata sample solution as a showcase. This will include:

  • Picking the right Test Double
  • Test Data Builders
  • Behavior Tests with BDDMockito
  • Prose-like Assertions with Hamcrest
  • Readability Sugar

The full Kata ruleset and a sample solution in Java 8 can be found on https://github.com/bkimminich/kata-tcg.