Working build script - Jacoco Code Coverage with Kotlin and Gradle 4.9 and Junit 5

build.gradle

buildscript {
    ext {
        kotlin_version = '1.2.71'
        junit_version = '5.3.1'
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

group 'de.foo'
version '1.0-SNAPSHOT'

apply plugin: 'kotlin'
apply plugin: 'jacoco'

sourceCompatibility = 1.8

dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"

    testImplementation "org.junit.jupiter:junit-jupiter-api:$junit_version"
    testImplementation "org.junit.jupiter:junit-jupiter-params:$junit_version"
}

compileKotlin {
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

compileTestKotlin {
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

test {
    jacoco {
        destinationFile = file("${buildDir}/jacoco/test.exec")
    }
}

jacoco {
    toolVersion = "0.8.2"
}