fun DistributionTest.setSystemPropertiesOfTestJVM(defaultVersions: String) {
    // use -PtestVersions=all or -PtestVersions=1.2,1.3…
    val integTestVersionsSysProp = "org.gradle.integtest.versions"
    val testVersions = project.providers.gradleProperty("testVersions")
    if (testVersions.isPresent) {
        systemProperties[integTestVersionsSysProp] = testVersions.get()
    } else {
        systemProperties[integTestVersionsSysProp] = defaultVersions

package okhttp3

import assertk.assertThat
import assertk.assertions.matches
import org.junit.jupiter.api.Test

class OkHttpTest {
  @Test
  fun testVersion() {
    assertThat(OkHttp.VERSION).matches(Regex("[0-9]+\\.[0-9]+\\.[0-9]+(-.+)?"))
  }