Speculative is a collection of unofficial community-driven specs for clojure.core.
Version 0.0.3 was just released.
Changes since the previous version: https://github.com/borkdude/speculative/blob/master/CHANGELOG.md#003-2019-02-08
Also the initial version of speculative/kaocha-plugin was released to Clojars:
This plugin makes instrumenting speculative specs in tests ran with kaocha easy.