* Registers a TearDown implementor which will be run after the test proper.
   *
   * <p>In JUnit4 language, that means as an {@code @After}.
   *
   * <p>In JUnit3 language, that means during the {@link junit.framework.TestCase#tearDown()} step.
   */
  void addTearDown(TearDown tearDown);

import java.util.Iterator;
import java.util.List;
import java.util.Map;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

/**
 * Unit test for {@link Helpers}.
 *
 * @author Chris Povirk
 */
@GwtCompatible
public class HelpersTest extends TestCase {
  public void testNullsBeforeB() {
    testComparator(NullsBeforeB.INSTANCE, "a", "azzzzzz", null, "b", "c");
  }

import java.util.Collection;
import java.util.Iterator;
import java.util.Queue;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Tests for {@link Synchronized#queue} and {@link Queues#synchronizedQueue}.
 *
 * @author Kurt Alfred Kluever
 */
public class SynchronizedQueueTest extends TestCase {

  protected Queue<String> create() {
    TestQueue<String> inner = new TestQueue<>();

import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import junit.framework.TestCase;

/**
 * Test class for {@link LittleEndianDataInputStream}.
 *
 * @author Chris Nokleberg
 */
public class LittleEndianDataInputStreamTest extends TestCase {

  private byte[] data;

  @Override
  protected void setUp() throws Exception {
    super.setUp();

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import junit.framework.TestCase;

/**
 * Test case for {@link ListenableFutureTask}.
 *
 * @author Sven Mawson
 */
public class ListenableFutureTaskTest extends TestCase {

  private ExecutorService exec;

  protected final CountDownLatch runLatch = new CountDownLatch(1);

import java.util.Iterator;
import java.util.List;
import java.util.Map;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

/**
 * Unit test for {@link Helpers}.
 *
 * @author Chris Povirk
 */
@GwtCompatible
public class HelpersTest extends TestCase {
  public void testNullsBeforeB() {
    testComparator(NullsBeforeB.INSTANCE, "a", "azzzzzz", null, "b", "c");
  }

import java.util.Map;
import java.util.Map.Entry;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

/**
 * Tests for {@code CompactHashMap}.
 *
 * @author Louis Wasserman
 */
public class CompactHashMapTest extends TestCase {
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(
        MapTestSuiteBuilder.using(

import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import junit.framework.TestCase;

/**
 * Test class for {@link LittleEndianDataInputStream}.
 *
 * @author Chris Nokleberg
 */
public class LittleEndianDataInputStreamTest extends TestCase {

  private byte[] data;

  @Override
  protected void setUp() throws Exception {
    super.setUp();

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Unit tests for {@link Callables}.
 *
 * @author Isaac Shum
 */
@GwtCompatible(emulated = true)
public class CallablesTest extends TestCase {

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testReturning() throws Exception {

import com.google.common.annotations.GwtCompatible;
import com.google.common.escape.CharEscaper;
import junit.framework.TestCase;

/**
 * Tests for the {@link XmlEscapers} class.
 *
 * @author Alex Matevossian
 * @author David Beaumont
 */
@GwtCompatible
public class XmlEscapersTest extends TestCase {

  public void testXmlContentEscaper() throws Exception {