assertEquals(file, file2);
        final File junitJar = ResourceUtil.getBuildDir(TestCase.class);
        assertTrue(junitJar.exists());
        final URL url = junitJar.toURI().toURL();
        final URLClassLoader loader = new URLClassLoader(new URL[] { url });
        loader.loadClass(TestCase.class.getName());
    }

    /**
     * @throws Exception
     */
    public void testIsExist() throws Exception {

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.errorprone.annotations.concurrent.GuardedBy;
import java.lang.reflect.Method;
import java.net.URLClassLoader;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.errorprone.annotations.concurrent.GuardedBy;
import java.lang.reflect.Method;
import java.net.URLClassLoader;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

    // Now set the context loader to one that should find the resource.
    URL baseUrl = tempFile.getParentFile().toURI().toURL();
    URLClassLoader loader = new URLClassLoader(new URL[] {baseUrl});
    ClassLoader oldContextLoader = Thread.currentThread().getContextClassLoader();
    try {
      Thread.currentThread().setContextClassLoader(loader);

   * <p><b>Warning:</b> {@code ClassPath} can find classes and resources only from:
   *
   * <ul>
   *   <li>{@link URLClassLoader} instances' {@code file:} URLs
   *   <li>the {@linkplain ClassLoader#getSystemClassLoader() system class loader}. To search the
   *       system class loader even when it is not a {@link URLClassLoader} (as in Java 9), {@code
   *       ClassPath} searches the files from the {@code java.class.path} system property.

    // Now set the context loader to one that should find the resource.
    URL baseUrl = tempFile.getParentFile().toURI().toURL();
    URLClassLoader loader = new URLClassLoader(new URL[] {baseUrl});
    ClassLoader oldContextLoader = Thread.currentThread().getContextClassLoader();
    try {
      Thread.currentThread().setContextClassLoader(loader);

    URLClassLoader newLoader(URL base) {
      // We use the bootstrap class loader as the parent because Finalizer by design uses
      // only standard Java classes. That also means that FinalizableReferenceQueueTest
      // doesn't pick up the wrong version of the Finalizer class.
      return new URLClassLoader(new URL[] {base}, null);
    }
  }

    URLClassLoader newLoader(URL base) {
      // We use the bootstrap class loader as the parent because Finalizer by design uses
      // only standard Java classes. That also means that FinalizableReferenceQueueTest
      // doesn't pick up the wrong version of the Finalizer class.
      return new URLClassLoader(new URL[] {base}, null);
    }
  }

import java.lang.ref.Cleaner.Cleanable;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.net.ServerSocket;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;
import org.junit.After;
import org.junit.Test;

            .collect(Collectors.toSet());
    }

    @TaskAction
    public void doCheck() throws IOException {
        final String problems;

        try (
            URLClassLoader isolatedClassLoader = new URLClassLoader(
                getTestsClassPath().getFiles().stream().map(this::fileToUrl).toArray(URL[]::new)
            )
        ) {