Haskell

QuickCheck in Haskell: Property-Based Testing for Functional Code

Example-based testing asks "does this function return the right value for this specific input?" Property-based testing asks something harder: "does this function behave correctly for every possible input?" QuickCheck, the original property-based testing library that spawned a dozen ports across languages, answers that question by generating

Haskell

Testing in Haskell with HSpec: BDD-Style Unit Tests

Testing in a purely functional language like Haskell has a reputation for being either trivially easy (pure functions are referentially transparent, so you just call them) or surprisingly complex (dealing with IO, monads, and laziness). The truth is somewhere in the middle. HSpec, inspired by Ruby's RSpec, gives