/** The key of the configuration. e.g. root@localhost */
    String MAIL_RETURN_PATH = "mail.return.path";

    /**
     * Get the value of property as {@link String}.
     * @param propertyKey The key of the property. (NotNull)
     * @return The value of found property. (NotNull: if not found, exception)
     * @throws ConfigPropertyNotFoundException When the property is not found.

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListMap;
import junit.framework.Test;
import junit.framework.TestSuite;

/**
 * Generates a test suite covering the {@link Map} implementations in the {@link java.util} package.
 * Can be subclassed to specify tests that should be suppressed.
 *
 * @author Kevin Bourrillion
 */
@GwtIncompatible
public class TestsForMapsInJavaUtil {

              earlierRequirement),
          intersection(newFeatures, earlierFeatures),
          source);
    }
  }

  /**
   * Construct a new {@link java.util.Set} that is the intersection of the given sets.
   *
   * @deprecated Use {@link com.google.common.collect.Sets#intersection(Set, Set)} instead.
   */
  @Deprecated
  public static <T> Set<T> intersection(Set<? extends T> set1, Set<? extends T> set2) {

import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import java.lang.reflect.Constructor;
import java.util.concurrent.BlockingQueue;
import org.jspecify.annotations.NullUnmarked;

/**
 * Benchmarks for {@link Monitor}.
 *
 * @author Justin T. Sampson
 */
@NullUnmarked
public class MonitorBenchmark {

  @Param({"10", "100", "1000"})
  int capacity;

  @Param({"Array", "Priority"})
  String queueType;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TreeMap;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Test cases for {@link Tables#newCustomTable}.
 *
 * @author Jared Levy
 */
@GwtCompatible
@NullMarked
public class NewCustomTableTest extends AbstractTableTest<Character> {

  @Override

import org.junit.Ignore;

/**
 * A generic JUnit test which tests creation (typically through a constructor or static factory
 * method) of a list. Can't be invoked directly; please see {@link
 * com.google.common.collect.testing.ListTestSuiteBuilder}.
 *
 * @author Chris Povirk
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")

import java.io.File;
import java.io.FilenameFilter;
import java.util.regex.PatternSyntaxException;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link PatternFilenameFilter}.
 *
 * @author Chris Nokleberg
 */
@NullUnmarked
public class PatternFilenameFilterTest extends TestCase {

  public void testSyntaxException() {

import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Predicate;
import java.util.Map.Entry;
import java.util.Set;
import org.jspecify.annotations.Nullable;

/**
 * Implementation of {@link Multimaps#filterEntries(SetMultimap, Predicate)}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
final class FilteredEntrySetMultimap<K extends @Nullable Object, V extends @Nullable Object>

import java.util.concurrent.ExecutionException;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/** Unit tests for {@link Futures#getDone}. */
@GwtCompatible
@NullUnmarked
public class FuturesGetDoneTest extends TestCase {
  public void testSuccessful() throws ExecutionException {
    assertThat(getDone(immediateFuture("a"))).isEqualTo("a");

 * capabilities to the default HTTPS handler. This acts as a wrapper,
 * handling authentication and passing control to the underlying
 * stream handler.
 *
 * @deprecated {@link NtlmHttpURLConnection} is broken by design.
 */
@Deprecated
public class Handler extends jcifs.http.Handler {

    /**
     * The default HTTPS port (<code>443</code>).
     */