kotlin.test / kotlin.test / assertFalse assertFalse Common JVM JS Native 1.0 @JvmName("assertFalseInline") inline fun assertFalse( message: String? = null, block: () -> Boolean): Unit(source) Asserts that the given block returns false. Common JVM JS Native 1.0 fun assertFalse( actual: Boolean, message: String? = null): Unit(source) Asserts that the expression is false with an optional message.