proper
PropEr (PROPerty-based testing tool for ERlang) is a QuickCheck-inspired open-source property-based testing tool for Erlang, developed by Manolis Papadakis, Eirini Arvaniti and Kostis Sagonas. The base PropEr system was written mainly by Manolis Papadakis, and the stateful code testing subsystem by Eirini Arvaniti.