import java.util.Collection;
import java.util.List;
import java.util.Locale;

/**
 * Extension for tasks that should run with a Jacoco agent to generate coverage execution data.
 */
public abstract class JacocoTaskExtension {

    /**
     * The types of output that the agent can use for execution data.
     */
    public enum Output {
        FILE,
        TCP_SERVER,
        TCP_CLIENT,
        NONE;

        /**

        when:
        project.jacoco.applyTo(task)
        then:
        task.extensions.getByType(JacocoTaskExtension) != null
    }

    def 'jacoco applied to Test task'() {
        given:
        Test task = project.tasks.create('customTest', Test)
        expect:
        task.extensions.getByType(JacocoTaskExtension) != null
    }

    @Requires(UnitTestPreconditions.Online)
    @Issue("GRADLE-3498")

     *
     * @param tasks one or more tasks to add
     */
    public void executionData(Task... tasks) {
        for (Task task : tasks) {
            final JacocoTaskExtension extension = task.getExtensions().findByType(JacocoTaskExtension.class);
            if (extension != null) {

            }

            test {
                test.extensions.getByType(JacocoTaskExtension).destinationFile = new File("$jacocoDestinationFile")
                systemProperty "jacocoAgentJar", configurations.jacocoRuntime.singleFile.absolutePath
                systemProperty "jacocoDestFile", test.extensions.getByType(JacocoTaskExtension).destinationFile.absolutePath
            }

            gradlePlugin {

Accessors for org.gradle.plugins.ide.eclipse.model.ResourceFilterMatcher.id don't use symmetrical @Nullable

Method <org.gradle.testing.jacoco.plugins.JacocoTaskExtension.getPort()> does not have raw return type assignable to org.gradle.api.provider.Property in (JacocoTaskExtension.java:0)
Method <org.gradle.testing.jacoco.plugins.JacocoTaskExtension.getSessionId()> does not have raw return type assignable to org.gradle.api.provider.Property in (JacocoTaskExtension.java:0)

====
[source,java]
.JacocoAgent.java
----
class JacocoAgent implements CommandLineArgumentProvider {
    private final JacocoTaskExtension jacoco;

    public JacocoAgent(JacocoTaskExtension jacoco) {
        this.jacoco = jacoco;
    }

    @Nested
    @Optional
    public JacocoTaskExtension getJacoco() {
        return jacoco.isEnabled() ? jacoco : null;
    }

    @Override

* The `append` property on `JacocoTaskExtension` has been removed.
  `append` is now always configured to be true for the Jacoco agent.
* The `configureDefaultOutputPathForJacocoMerge` method on `JacocoPlugin` has been removed.
  The method was never meant to be public.