Keploy is an open-source testing tool that generates API tests and dependency mocks from real traffic.

For Elixir services, it records real HTTP and Ecto traffic from a running BEAM process and replays it as test assertions. It works at the network layer, so your app code stays unchanged.

Supports Phoenix, Plug and Cowboy on Elixir 1.14+.

Record: keploy record -c “mix phx.server”

Replay: keploy test -c “mix phx.server” –delay 10

Elixir guide: https://keploy.io/testing/elixir Phoenix guide: https://keploy.io/testing/phoenix GitHub: https://github.com/keploy/keploy