import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import org.jspecify.annotations.Nullable;

/**
 * An implementation of {@link GraphConnections} for directed graphs.
 *
 * @author James Sexton
 * @author Jens Nyman
 * @param <N> Node parameter type
 * @param <V> Value parameter type
 */
final class DirectedGraphConnections<N, V> implements GraphConnections<N, V> {
  /**

import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Tests com.google.common.base.Suppliers.
 *
 * @author Laurence Gonsalves
 * @author Harry Heymann
 */
@NullMarked
@GwtCompatible
public class SuppliersTest extends TestCase {

  static class CountingSupplier implements Supplier<Integer> {
    int calls = 0;

    @Override

import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Tests com.google.common.base.Suppliers.
 *
 * @author Laurence Gonsalves
 * @author Harry Heymann
 */
@NullMarked
@GwtCompatible
public class SuppliersTest extends TestCase {

  static class CountingSupplier implements Supplier<Integer> {
    int calls = 0;

    @Override

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.AbstractCollectionTester;
import org.junit.Ignore;

/**
 * Tests {@link java.util.Collection#equals}.
 *
 * @author George van den Driessche
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")

import java.util.List;

/**
 * Creates, based on your criteria, a JUnit test suite that exhaustively tests a ConcurrentMap
 * implementation.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible
public class ConcurrentMapTestSuiteBuilder<K, V> extends MapTestSuiteBuilder<K, V> {
  public static <K, V> ConcurrentMapTestSuiteBuilder<K, V> using(TestMapGenerator<K, V> generator) {

import java.util.Map.Entry;
import java.util.SortedMap;
import org.jspecify.annotations.NullMarked;

/**
 * Implementation helper for {@link TestMapGenerator} for use with sorted maps of strings.
 *
 * @author Chris Povirk
 */
@GwtCompatible
@NullMarked
public abstract class TestStringSortedMapGenerator extends TestStringMapGenerator
    implements TestSortedMapGenerator<String, String> {
  @Override

import java.util.List;

/**
 * Creates, based on your criteria, a JUnit test suite that exhaustively tests a ConcurrentMap
 * implementation.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible
public class ConcurrentMapTestSuiteBuilder<K, V> extends MapTestSuiteBuilder<K, V> {
  public static <K, V> ConcurrentMapTestSuiteBuilder<K, V> using(TestMapGenerator<K, V> generator) {

import java.util.List;
import java.util.Set;
import org.jspecify.annotations.NullMarked;

/**
 * An abstract TestSetGenerator for generating sets containing enum values.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@NullMarked
public abstract class TestEnumSetGenerator implements TestSetGenerator<AnEnum> {
  @Override
  public SampleElements<AnEnum> samples() {
    return new Enums();
  }

import java.util.Map.Entry;
import java.util.SortedMap;
import org.jspecify.annotations.NullMarked;

/**
 * Implementation helper for {@link TestMapGenerator} for use with sorted maps of strings.
 *
 * @author Chris Povirk
 */
@GwtCompatible
@NullMarked
public abstract class TestStringSortedMapGenerator extends TestStringMapGenerator
    implements TestSortedMapGenerator<String, String> {
  @Override

package com.google.common.testing;

import com.google.common.annotations.GwtCompatible;
import org.jspecify.annotations.NullMarked;

/**
 * An object that can perform a {@link #tearDown} operation.
 *
 * @author Kevin Bourrillion
 * @since 10.0
 */
@FunctionalInterface
@GwtCompatible
@NullMarked
public interface TearDown {
  /**
   * Performs a <b>single</b> tear-down operation. See test-libraries-for-java's {@code