Hedgehog automatically generates a comprehensive array of test cases, exercising your software in ways human testers would never imagine.

Generate hundreds of test cases automatically, exposing even the most insidious of corner cases. Failures are automatically simplified, giving developers coherent, intelligible error messages.

Features:

- Integrated shrinking, shrinks obey invariants by construction.
- Abstract state machine testing.
- Generators allow monadic effects.
- Range combinators for full control over the scope of generated numbers and collections.
- Equality and roundtrip assertions show a diff instead of the two inequal values.
- Template Haskell test runner which executes properties concurrently.

https://github.com/hedgehogqa/haskell-hedgehog

#haskell

Also available for #scala, #fsharp, #csharp, and #r