classRealm.importFromParent(imp);
            }
        }
    }

    private static Object getId(ClassLoader classLoader) {
        if (classLoader instanceof ClassRealm classRealm) {
            return classRealm.getId();
        }
        return classLoader;
    }

   * 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());

   * 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());

    /**
     * Use a WeakHashMap here, so the keys (Class objects) can be garbage collected.
     * This approach prevents permgen space overflows due to retention of discarded
     * classloaders.
     */
    private static final Map<Class<?>, WeakReference<ClassMap>> CLASS_MAPS = new WeakHashMap<>();

    static final int EOF = -1;

    static final char PROPERTY_START = '.';

    "path": "platforms/core-runtime/build-state",
    "unitTests": true,
    "functionalTests": false,
    "crossVersionTests": false
  },
  {
    "name": "classloaders",
    "path": "platforms/core-runtime/classloaders",
    "unitTests": false,
    "functionalTests": false,
    "crossVersionTests": false
  },
  {
    "name": "cli",
    "path": "platforms/core-runtime/cli",

/**
 * Unit test for {@link FinalizableReferenceQueue}.
 *
 * @author Bob Lee
 */
// - depends on details of GC and classloading
// - .class files aren't available
// - possibly no real concept of separate ClassLoaders?
@AndroidIncompatible
@GwtIncompatible
@RunWith(JUnit4.class)
@NullUnmarked
public class FinalizableReferenceQueueTest {

  private @Nullable FinalizableReferenceQueue frq;

  @After

            <option value="$PROJECT_DIR$/platforms/core-runtime/build-profile" />
            <option value="$PROJECT_DIR$/platforms/core-runtime/build-state" />
            <option value="$PROJECT_DIR$/platforms/core-runtime/classloaders" />
            <option value="$PROJECT_DIR$/platforms/core-runtime/cli" />
            <option value="$PROJECT_DIR$/platforms/core-runtime/client-services" />

  @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]);
  }

    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 {