JUnit @Rules with Kotlin

While testing a service with WireMock, which uses a JUnit @Rule, we ran into an issue where JUnit rules are supposed to be private final fields, Kotlin does not directly support fields, and instead has properties that had field access.

The solution is to use Kotlin’s @JvmField annotation as well as marking the field as final.

@Rule
@JvmField
final val wireMockRule = WireMockRule(8181)

Sep 2, 2017