Expekt is a (work in progress) BDD assertion library for Kotlin, inspired by Chai.js. It works with your favorite test runner such as JUnit and Spek. class ExpektTest { @Test fun helloExpekt() { 23.should.equal(23) "Kotlin".should.not.contain("Scala") listOf(1, 2, 3).should.have.size.above(1) } } Follow on Twitter for updates! Getting started Expekt is available via Maven Central. Just add the dep