Practical ScalaCheck

on YouTube ↗53m

" summary

Shows concrete Scalacheck recipes: when to use Gen vs Arbitrary, why Cogen makes generated functions meaningful (ScalaCheck 1.11.3), how shrinking and collect/labels expose minimal failing cases, and why prefer custom generators to implication. Gives the exact surprising defaults (100 tests, shrink behavior), how to raise counts (sbt to 1_000_000), boilerplate reduction via scalacheck‑shapeless, refined and a 47degrees date generator that produces sensible ranges for Joda and java8 datetime.

AI-written summary · about

" chapters (4)

1. 0:00Start
2. 16:47The Arbitrary Typeclass
3. 20:39Testing Winning Hands
4. 41:31Using scalacheck-shapeless

" related talks

• 01h 00mA New Approach to Testing with ScalaCheck / Property Based TestingDavid Galichet · Scala.IO 2014
• 27mRANDOM DATA GENERATION WITH SCALACHECKDaniela Sfregola · Scalar Conference 2017
• 31mProperty-based testing - let your testing library work for youMagda Stożek · Scala Love in the City 2021
• 46mTesting in the world of Functional ProgrammingLuka Jacobowitz · Lambda World Cádiz 2018
• 41mBuilding test check GeneratorsGary Fredericks · Clojure/conj 2017
• 36mTesting for Lawful Good AdventuresChristopher Phelps · LambdaConf 2018
• 47mSpecs2, from starters to dessert and... a look in the kitchen.Eric torreborre · Scala.IO 2017
• 31mSCALATEST: YOU'RE ASSERTING IT WRONGJacek Kunicki · Scalar 2019