/**
 * A utility for communicating with a VM in debug mode using JDWP.
 */
class JDWPUtil implements TestRule {
    String host
    Integer port
    def vm
    def connection
    def connectionArgs

    JDWPUtil() {
        this(FixedAvailablePortAllocator.instance.assignPort())
    }

    JDWPUtil(Integer port) {
        this("127.0.0.1", port)

    def "can debug with org.gradle.debug=true"() {
        given:
        Assume.assumeTrue(debugPortIsFree())
        executer.requireDaemon().requireIsolatedDaemons()
        JDWPUtil jdwpClient = new JDWPUtil(5005)

        when:
        def gradle = executer.withArgument("-Dorg.gradle.debug=true").withTasks("help").start()

        then:
        ConcurrentTestUtil.poll() {

import spock.lang.Timeout

@TargetGradleVersion(">=5.6")
@Timeout(60)
class TestLauncherDebugTestsCrossVersionTest extends ToolingApiSpecification implements WithOldConfigurationsSupport {
    @Rule
    JDWPUtil jdwpClient = new JDWPUtil()

    def setup() {
        buildFile << """
            plugins { id 'java-library' }
            ${mavenCentralRepository()}

import org.junit.Rule
import spock.lang.Issue

@Flaky(because = "https://github.com/gradle/gradle-private/issues/3612")
class JavaExecDebugIntegrationTest extends AbstractIntegrationSpec {

    @Rule
    JDWPUtil debugClient = new JDWPUtil()

    def setup() {
        executer.beforeExecute {
            // When waiting for debugger/target JVM, there might be:
            // com.sun.jdi.connect.TransportTimeoutException: timeout waiting for connection

                .withTaskAndTestClasses(':app:test', Arrays.asList('TestClass1'))
                .setStandardOutput(stdout)
            if (debugMode) {
                // JDWPUtil is flaky https://github.com/gradle/gradle/issues/26366
                testLauncher.debugTestsOn(49052 + (retryCounter++))
            }
            testLauncher.run(resultHandlerFor(debugMode))
        }