@Test
  public void testUnloadable() throws Exception {
    WeakReference<ClassLoader> loaderRef = useFrqInSeparateLoader();
    GcFinalization.awaitClear(loaderRef);
  }

  private URL[] getClassPathUrls() {
    ClassLoader classLoader = getClass().getClassLoader();
    return classLoader instanceof URLClassLoader
        ? ((URLClassLoader) classLoader).getURLs()
        : parseJavaClassPath().toArray(new URL[0]);
  }

   * disallows certain core JDK classes.
   */
  private void runTestMethod(ClassLoader classLoader) throws Exception {
    ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();

    Thread.currentThread().setContextClassLoader(classLoader);
    try {
      Class<?> test = classLoader.loadClass(AbstractFutureTest.class.getName());

    URL url2 = new URL("file:/b");
    URLClassLoader classloader = new URLClassLoader(new URL[] {url1, url2}, null);
    assertThat(ClassPath.getClassPathEntries(classloader))
        .containsExactly(new File("/a"), classloader, new File("/b"), classloader);
  }

  @AndroidIncompatible // Android forbids null parent ClassLoader
  public void testClassPathEntries_urlClassLoader_withParent() throws Exception {

    URL url2 = new URL("file:/b");
    URLClassLoader classloader = new URLClassLoader(new URL[] {url1, url2}, null);
    assertThat(ClassPath.getClassPathEntries(classloader))
        .containsExactly(new File("/a"), classloader, new File("/b"), classloader);
  }

  @AndroidIncompatible // Android forbids null parent ClassLoader
  public void testClassPathEntries_urlClassLoader_withParent() throws Exception {

    }
    return builder.build();
  }

  @VisibleForTesting
  static ImmutableMap<File, ClassLoader> getClassPathEntries(ClassLoader classloader) {
    LinkedHashMap<File, ClassLoader> entries = new LinkedHashMap<>();
    // Search parent first, since it's the order ClassLoader#loadClass() uses.
    ClassLoader parent = classloader.getParent();
    if (parent != null) {
      entries.putAll(getClassPathEntries(parent));
    }

    assertFalse(bar.isAnnotationPresent(ExampleAnnotation.class));
  }

  @J2ktIncompatible
  private URL[] getClassPathUrls() {
    ClassLoader classLoader = getClass().getClassLoader();
    return classLoader instanceof URLClassLoader
        ? ((URLClassLoader) classLoader).getURLs()
        : parseJavaClassPath().toArray(new URL[0]);
  }

  /**

        assertTrue(exceptionHandled.get());
    }

    // Test with a custom ClassLoader to simulate class availability
    @Test
    public void test_hook_withCustomClassLoader() throws Exception {
        // Create a custom ClassLoader that can control class loading behavior
        ClassLoader customClassLoader = new URLClassLoader(new URL[0], null) {
            @Override

   * disallows certain core JDK classes.
   */
  private void runTestMethod(ClassLoader classLoader) throws Exception {
    ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();

    Thread.currentThread().setContextClassLoader(classLoader);
    try {
      Class<?> test = classLoader.loadClass(AbstractFutureTest.class.getName());

        private final GroovyClassLoader classLoader;

        CachedScript(final Class<? extends Script> scriptClass, final GroovyClassLoader classLoader) {
            this.scriptClass = scriptClass;
            this.classLoader = classLoader;
        }

        void close() {
            try {
                classLoader.clearCache();
                classLoader.close();
            } catch (final IOException e) {

   * Runs the corresponding {@link FuturesTest} test method in a new classloader that disallows
   * certain core JDK classes.
   */
  private void runTestMethod(ClassLoader classLoader) throws Exception {
    ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
    Thread.currentThread().setContextClassLoader(classLoader);
    try {
      Class<?> test = classLoader.loadClass(FuturesTest.class.getName());