kotlin.test / kotlin.test / assertNotNull assertNotNull Common JVM JS Native 1.0 fun <T : Any> assertNotNull( actual: T?, message: String? = null): T(source) Asserts that the actual value is not null, with an optional message. Common JVM JS Native 1.0 inline fun <T : Any, R> assertNotNull( actual: T?, message: String? = null, block: (T) -> R): Unit(source) Asserts that the actual value is not null, with an optional message and a function block to process the not-null value.