colons := strings.Count(host, ":")
	if colons == 0 {
		return false
	}
	if colons == 1 {
		return true
	}
	return host[0] == '[' && strings.Contains(host, "]:")
}

// jarKey returns the key to use for a jar.
func jarKey(host string, psl PublicSuffixList) string {
	if isIP(host) {
		return host
	}

	var i int
	if psl == nil {
		i = strings.LastIndex(host, ".")
		if i <= 0 {
			return host

	".net":          ".net",
	"a.":            "a.",
	"b.a.":          "a.",
	"weird.stuff..": ".",
}

func TestJarKey(t *testing.T) {
	for host, want := range jarKeyTests {
		if got := jarKey(host, testPSL{}); got != want {
			t.Errorf("%q: got %q, want %q", host, got, want)
		}
	}
}

var jarKeyNilPSLTests = map[string]string{
	"foo.www.example.com": "example.com",

import java.util.Collections;
import java.util.List;
import java.util.SortedSet;

/**
 * Create integer sets for testing collections that are sorted by natural ordering.
 *
 * @author Chris Povirk
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestIntegerSortedSetGenerator extends TestIntegerSetGenerator {
  @Override
  protected abstract SortedSet<Integer> create(Integer[] elements);

import com.google.common.collect.testing.MapInterfaceTest;
import java.util.Collection;
import java.util.Map;

/**
 * Test {@link Multimap#asMap()} for an unmodifiable multimap with {@link MapInterfaceTest}.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public class UnmodifiableMultimapAsMapImplementsMapTest
    extends AbstractMultimapAsMapImplementsMapTest {

import com.google.common.annotations.GwtCompatible;
import java.util.Queue;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Creates queues, containing sample elements, to be tested.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public interface TestQueueGenerator<E extends @Nullable Object> extends TestCollectionGenerator<E> {
  @Override
  Queue<E> create(Object... elements);

import com.google.common.annotations.GwtCompatible;
import java.util.Queue;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Creates queues, containing sample elements, to be tested.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public interface TestQueueGenerator<E extends @Nullable Object> extends TestCollectionGenerator<E> {
  @Override
  Queue<E> create(Object... elements);

import com.google.common.collect.testing.TestCollectionGenerator;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Creates multisets, containing sample elements, to be tested.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public interface TestMultisetGenerator<E extends @Nullable Object>
    extends TestCollectionGenerator<E> {
  @Override
  Multiset<E> create(Object... elements);

import com.google.common.collect.testing.TestCollectionGenerator;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Creates multisets, containing sample elements, to be tested.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public interface TestMultisetGenerator<E extends @Nullable Object>
    extends TestCollectionGenerator<E> {
  @Override
  Multiset<E> create(Object... elements);

import com.google.common.collect.testing.SampleElements.Strings;
import java.util.Collection;
import java.util.List;

/**
 * String creation for testing arbitrary collections.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestStringCollectionGenerator implements TestCollectionGenerator<String> {
  @Override
  public SampleElements<String> samples() {

import java.util.Collections;
import java.util.List;
import java.util.SortedSet;

/**
 * Create integer sets for testing collections that are sorted by natural ordering.
 *
 * @author Chris Povirk
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestIntegerSortedSetGenerator extends TestIntegerSetGenerator {
  @Override
  protected abstract SortedSet<Integer> create(Integer[] elements);