Test Automation
Testing effectful Haskell code is where the language's type system earns its reputation. By abstracting over effects — whether through MTL typeclasses or algebraic effect systems like Polysemy — you can run production code with a pure test interpreter. No mocking frameworks, no monkey-patching, just different interpreters for different
Test Automation
Tasty is a composable test framework for Haskell. It doesn't replace HUnit, QuickCheck, or Hedgehog — it organizes them. Tasty provides a TestTree abstraction that lets you mix testing libraries, run tests in parallel, filter by name, and generate multiple output formats from a single test suite. The Core
Test Automation
HSpec is Haskell's most widely used test framework for unit and integration tests. Beyond basic describe/it blocks, it offers hooks, shared context, custom matchers, and tight integration with QuickCheck. This guide covers the patterns that matter for large test suites. Setup and Structure Refresher import Test.Hspec
Test Automation
Hedgehog is a modern property-based testing library for Haskell that addresses QuickCheck's main pain point: shrinking. Where QuickCheck requires manual shrink implementations, Hedgehog shrinks automatically because shrinking is built into the generator itself. The Key Difference from QuickCheck In QuickCheck, generation and shrinking are separate. You write