Get a logger in Kotlin using the class name of a lambda

ClassLoggerWithLambda.kt

package com.example.nieldw

import org.apache.logging.log4j.LogManager
import org.apache.logging.log4j.Logger
import org.junit.jupiter.api.Test

fun logger(lambda: () -> Unit): Lazy<Logger> = lazy { LogManager.getLogger(getClassName(lambda.javaClass)) }
private fun <T : Any> getClassName(clazz: Class<T>): String = clazz.name.replace(Regex("""\$.*$"""), "")

class TopLevelLoggingTest {
    val classLog by logger { }
  
    @Test
    fun `What is the javaClass?`() {
        classLog.info("THIS IS IT")
    }
}