Property-based State Machine Testing • Andrew McCluskey • YOW! 2018

This presentation was recorded at YOW! 2018. #GOTOcon #YOW https://yowcon.com Andrew McCluskey - Functional Programming Engineer at Data61 ABSTRACT Automated testing is key to ensuring the ongoing health and well being of any software project, giving developers and users confidence that their software works as intended. Property based testing is a significant step forward compared to traditional unit tests, exercising code with randomly generated inputs to ensure that key properties hold However, both of these techniques tend to be used at the level of individual functions. Many important properties of an application only appear at a higher level, and depend on the state of the application under test. The Haskell library hedgehog, a relative newcomer to the property based testing world, includes facilities for property-based state machine testing, giving developers a foundation on which to build these more complicated tests. In this talk, Andrew will give you an introduction to state machine property testing using hedgehog.He'll start with a quick refresher on property based testing, followed by a brief introduction to state machines and the sorts of applications they can be used to model. From there, he'll take you on a guided tour of hedgehog's state machine testing facilities. Finally, Andrew will present a series of examples to show off what you can do and hopefully give you enough ideas to start applying this tool to your own projects. The application being tested will be a servant web application, and examples will include testing fundamentals such as content creation and deletion, uniqueness constraints, and authentication. An intermediate knowledge of Haskell and familiarity with property based testing will be beneficial, but not essential. The slides and demo application will be available after the talk for people to study in detail. [...] RECOMMENDED BOOKS Vitaly Bragilevsky • Haskell in Depth • https://amzn.to/3EXpmbe Rebecca Skinner • Effective Haskell • https://amzn.to/3VgUKsh Graham Hutton • Programming in Haskell • https://amzn.to/3Fi8rBC John Whitington • Haskell from the Very Beginning • https://amzn.to/3VmX68R Gregor Hohpe • The Software Architect Elevator • https://amzn.to/3F6d2ax Henney & Monson-Haefel • 97 Things Every Software Architect Should Know • https://amzn.to/3pZuHsQ Matthew Skelton & Manuel Pais • Team Topologies • http://amzn.to/3sVLyLQ Forsgren, Humble & Kim • Accelerate: The Science of Lean Software and DevOps • https://amzn.to/3tCz1xO https://twitter.com/GOTOcon https://www.linkedin.com/company/goto- https://www.facebook.com/GOTOConferences #Haskell #HaskellProgramming #StateMachineTesting #PropertyTesting #PropertyBasedTesting #Testing #ProgrammingLanguage #FunctionalProgramming #AndrewMcCluskey #Data61 #YOWcon Looking for a unique learning experience? Attend the next GOTO conference near you! Get your ticket at https://gotopia.tech Sign up for updates and specials at https://gotopia.tech/newsletter SUBSCRIBE TO OUR CHANNEL - new videos posted almost daily. https://www.youtube.com/user/GotoConferences/?sub_confirmation=1