kotlin.test / kotlin.test / DefaultAsserter / fail fail Common JVM JS Native 1.0 fun fail ( message : String ? ) : Nothing (source) Fails the current test with the specified message. Parameters message - the message to report. Common JVM JS Native 1.4 fun fail ( message : String ? , cause : Throwable ? ) : Nothing (source) Fails the current test with the specified message and cause exception. Parameters message - the message to report. cause - the exception to set as the root cause of the reported failure.