* testing {@link Object#equals} because more than one sample instances are needed for testing
   * inequality.
   */
  protected final <T> void setDefault(Class<T> type, T value) {
    tester.setDefault(type, value);
  }

  /**
   * Sets two distinct values for {@code type}. These values can be used for both null pointer
   * testing and equals testing.
   *
   * @since 17.0

            String username = System.getenv("MVNW_USERNAME");
            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
            Authenticator.setDefault(new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }

    }
  }

  public void testNullPointers() {
    NullPointerTester tester =
        new NullPointerTester()
            .setDefault(byte[].class, "secret key".getBytes(UTF_8))
            .setDefault(HashCode.class, HashCode.fromLong(0));
    tester.testAllPublicStaticMethods(Hashing.class);
  }

  public void testSeedlessHashFunctionEquals() throws Exception {

      Thread.currentThread().setContextClassLoader(oldContextLoader);
    }
  }

  @AndroidIncompatible // .class files aren't available
  public void testNulls() {
    new NullPointerTester()
        .setDefault(URL.class, classfile(ResourcesTest.class))
        .testAllPublicStaticMethods(Resources.class);
  }

  private static URL classfile(Class<?> c) {
    return c.getResource(c.getSimpleName() + ".class");
  }

  @get:JvmName("proxySelector")
  val proxySelector: ProxySelector =
    when {
      // Defer calls to ProxySelector.getDefault() because it can throw a SecurityException.
      builder.proxy != null -> NullProxySelector
      else -> builder.proxySelector ?: ProxySelector.getDefault() ?: NullProxySelector
    }

  @get:JvmName("proxyAuthenticator")
  val proxyAuthenticator: Authenticator =

          .put("HmacSHA512", SHA512_KEY, Hashing.hmacSha512(SHA512_KEY))
          .build();

  public void testNulls() {
    NullPointerTester tester =
        new NullPointerTester().setDefault(String.class, "HmacMD5").setDefault(Key.class, MD5_KEY);
    tester.testAllPublicConstructors(MacHashFunction.class);
    tester.testAllPublicInstanceMethods(new MacHashFunction("HmacMD5", MD5_KEY, "toString"));
  }

 * When the non-null default value for a particular parameter type cannot be provided by {@code
 * NullPointerTester}, the caller can provide a custom non-null default value for the parameter type
 * via {@link #setDefault}.
 *
 * @author Kevin Bourrillion
 * @since 10.0
 */
@GwtIncompatible
@J2ktIncompatible
@ElementTypesAreNonnullByDefault
public final class NullPointerTester {

    public void testConnectTimeoutRead () throws IOException {
        Set<Thread> threadsBefore = new HashSet<>(Thread.getAllStackTraces().keySet());
        try ( ServerSocket ss = ServerSocketFactory.getDefault().createServerSocket(0, -1, InetAddress.getLoopbackAddress()) ) {
            int port = ss.getLocalPort();
            InetAddress addr = ss.getInetAddress();

            long start = System.currentTimeMillis();

 * When the non-null default value for a particular parameter type cannot be provided by {@code
 * NullPointerTester}, the caller can provide a custom non-null default value for the parameter type
 * via {@link #setDefault}.
 *
 * @author Kevin Bourrillion
 * @since 10.0
 */
@GwtIncompatible
@J2ktIncompatible
@ElementTypesAreNonnullByDefault
public final class NullPointerTester {

import sysconfig as _sysconfig
import importlib
import inspect as _inspect
import os as _os
import site as _site
import sys as _sys

_os.environ.setdefault("ENABLE_RUNTIME_UPTIME_TELEMETRY", "1")

# Do not remove this line; See https://github.com/tensorflow/tensorflow/issues/42596
from tensorflow.python import pywrap_tensorflow as _pywrap_tensorflow  # pylint: disable=unused-import