build.gradle

plugins {
    id 'java'
}

repositories {
    mavenCentral()
}

dependencies {
    testImplementation("org.junit.jupiter:junit-jupiter-api:5.6.2")
    testImplementation("org.junit.jupiter:junit-jupiter-params:5.6.2")
    testImplementation("org.junit.jupiter:junit-jupiter-engine:5.6.2")
    testImplementation("com.approvaltests:approvaltests:9.3.0")
}

tasks.withType(JavaCompile) {
    options.encoding = 'UTF-8'
    options.compilerArgs.add("-Xlint:all")
    options.incremental = true

    if (jdkWithPreviewFeatures())
        options.compilerArgs.add("--enable-preview")
}

test {
    useJUnitPlatform()
    testLogging {
        events "passed", "skipped", "failed"
    }

    if (jdkWithPreviewFeatures())
        jvmArgs("--enable-preview")
}

static def jdkWithPreviewFeatures() {
    def currentJvm = org.gradle.internal.jvm.Jvm.current()
    def matcher = currentJvm =~ /^\d+/
    return matcher[0].toInteger() > 11
}