BDD Assertions with Expekt for Kotlin

Fri, 26 Oct 2018 00:00:00 +0000

Behavior-Driven Development (BDD) has became quite a popular strategy for writing tests in the past ten or so years. BDD is a style of test-writing that focuses on test cases that flow like natural English sentences. Expekt is one such library for writing JUnit assertions in Kotlin. Combining JUnit and Expekt you can achieve results like this:

class FormatterTest {
  @Test
  fun shouldFormatFloatsWithADollarSignAndTwoDecimalPlaces() {
    Formatter.format(1.2345).to.equal("$1.23")
  }
}

Adding Expekt to Your Project

As of writing, the current version of Expekt is 0.5.0 so that’s the one we’ll include in our project. If you’re using Gradle, you can add the following to your dependency list in your build.gradle.

Bdd on BradCypert.com

BDD Assertions with Expekt for Kotlin

Adding Expekt to Your Project