kotlin-test/kotlin.test/assertNull

assertNull

fun assertNull(actual: Any?, message: String? = null)(source)

Asserts that the actual value is null, with an optional message.

Since Kotlin

1.0
@ExperimentalKotlinTestApi
fun assertNull(actual: Any?, lazyMessage: () -> String)(source)

Asserts that the actual value is null, with an error message generated by the lazyMessage lambda otherwise.

Since Kotlin

2.4