Spek + Kts + Jacoc

build.gradle.kts

val jacocoTestResultTaskName = "jacocoJunit5TestReport"
val junitPlatformTest: JavaExec by tasks
jacoco {
    toolVersion = "0.8.2"
    applyTo(junitPlatformTest)
}

task<JacocoReport>(jacocoTestResultTaskName) {
    group = LifecycleBasePlugin.VERIFICATION_GROUP
    description = "Generates code coverage report for the ${junitPlatformTest.name} task."

    executionData(junitPlatformTest)
    dependsOn(junitPlatformTest)

    //   sourceSets(sourceSets["main"])
    sourceDirectories = files("src/main/kotlin")
    classDirectories = files("build/kotlin/main")

    reports {
        html.isEnabled = true
        xml.isEnabled = true
        csv.isEnabled = true
        html.destination = File("$buildDir/reports/")

    }
}