import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import static org.gradle.internal.FileUtils.hasExtension;

public class JarFilePackageLister {
    public void listJarPackages(File jarFile, JarFilePackageListener listener) {
        if (jarFile == null) {
            throw new IllegalArgumentException("jarFile is null!");
        }

    private final TestFile zipFile = testDir.file("lib.jar")
    private final ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile))

    def lister = new JarFilePackageLister()
    def listener = Mock(JarFilePackageListener)

    def setup() {
        out.withCloseable {
            it.putNextEntry(new ZipEntry("com/a/b/c/"))

     *
     * @param libraryJar Jar file to add to the index.
     */
    public void addLibraryJar(final File libraryJar) {
        new JarFilePackageLister().listJarPackages(libraryJar, new JarFilePackageListener() {
            @Override
            public void receivePackage(String packageName) {
                Set<File> jarFiles = packageJarFilesMappings.get(packageName);

Class <org.gradle.api.internal.tasks.testing.detection.JarFilePackageLister> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (JarFilePackageLister.java:0)