}

  public void testNullFriendlyTransform() {
    Iterator<@Nullable Integer> input = Arrays.<@Nullable Integer>asList(1, 2, null, 3).iterator();
    Iterator<String> result =
        Iterators.transform(
            input,
            new Function<@Nullable Integer, String>() {
              @Override
              public String apply(@Nullable Integer from) {
                return String.valueOf(from);
              }

import java.lang.ref.WeakReference;
import java.util.Iterator;
import java.util.NoSuchElementException;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@code AbstractIterator}.
 *
 * @author Kevin Bourrillion
 */
@SuppressWarnings("serial") // No serialization is used in this test
@GwtCompatible
@NullMarked

import static com.google.common.base.Preconditions.checkNotNull;
import static java.lang.Math.min;

import com.google.common.annotations.GwtCompatible;
import java.util.Map;
import org.jspecify.annotations.Nullable;

/**
 * A {@link UnicodeEscaper} that uses an array to quickly look up replacement characters for a given
 * code point. An additional safe range is provided that determines whether code points without

import com.google.common.annotations.GwtCompatible;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * To be implemented by test generators of things that can contain elements. Such things include
 * both {@link Collection} and {@link Map}; since there isn't an established collective noun that

import com.google.common.collect.testing.AbstractCollectionTester;
import java.util.Collection;
import java.util.List;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;
import org.junit.Ignore;

/**
 * Base class for list testers.
 *
 * @author George van den Driessche
 */
@GwtCompatible
@NullMarked

import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Collection;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import org.jspecify.annotations.Nullable;

/**
 * A {@link BlockingQueue} which forwards all its method calls to another {@link BlockingQueue}.
 * Subclasses should override one or more methods to modify the behavior of the backing collection

import java.util.Comparator;
import java.util.Iterator;
import org.jspecify.annotations.Nullable;

/**
 * An {@code Iterable} whose elements are sorted relative to a {@code Comparator}, typically
 * provided at creation time.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
interface SortedIterable<T extends @Nullable Object> extends Iterable<T> {
  /**

 * limitations under the License.
 */

package com.google.common.eventbus.outside;

import com.google.common.eventbus.EventBus;
import junit.framework.TestCase;
import org.jspecify.annotations.Nullable;

/**
 * Abstract base class for tests that EventBus finds the correct subscribers.
 *
 * <p>The actual tests are distributed among the other classes in this package based on whether they

import java.util.Comparator;
import java.util.Iterator;
import org.jspecify.annotations.Nullable;

/**
 * An {@code Iterable} whose elements are sorted relative to a {@code Comparator}, typically
 * provided at creation time.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
interface SortedIterable<T extends @Nullable Object> extends Iterable<T> {
  /**

      new IteratorOperation() {
        @Override
        public @Nullable Object execute(Iterator<?> iterator) {
          iterator.remove();
          return null;
        }
      };

  private static final IteratorOperation NEXT_METHOD =
      new IteratorOperation() {
        @Override
        public @Nullable Object execute(Iterator<?> iterator) {
          return iterator.next();
        }