Packages

Builds on the Mox pattern — generates behaviours and dispatch facades from `defcallback` declarations — and adds stateful test doubles powerful enough to test Ecto.Repo operations without a database.

Effectful programming for Elixir: write business logic as pure effect descriptions, swap handlers for testing. Built on algebraic effects and bundled with a substantial library of effects including cooperative coroutines, automatic query batching, and DoubleDown boundary integration.

HexPort: Hexagonal architecture ports for Elixir. Typed port contracts with async-safe test doubles, dispatch logging, and stateful test handlers. Define boundaries with `defport`, swap implementations for testing without a database.

Algebraic effects and handlers for Elixir.