assertEquals(0, ticker.read());
    assertEquals(10, ticker.read());
    assertEquals(20, ticker.read());
  }

  public void testAutoIncrementStep_millis() {
    FakeTicker ticker = new FakeTicker().setAutoIncrementStep(1, TimeUnit.MILLISECONDS);
    assertEquals(0, ticker.read());
    assertEquals(1000000, ticker.read());
    assertEquals(2000000, ticker.read());
  }

/**
 * A mutable object which accumulates double values and tracks some basic statistics over all the
 * values added so far. The values may be added singly or in groups. This class is not thread safe.
 *
 * @author Pete Gillin
 * @author Kevin Bourrillion
 * @since 20.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public final class StatsAccumulator {

import java.util.stream.DoubleStream;

/**
 * Inputs, expected outputs, and helper methods for tests of {@link StatsAccumulator}, {@link
 * Stats}, {@link PairedStatsAccumulator}, and {@link PairedStats}.
 *
 * @author Pete Gillin
 */
class StatsTesting {
  // TODO(cpovirk): Convince myself that this larger error makes sense.
  static final double ALLOWED_ERROR = isAndroid() ? .25 : 1e-10;

  // Inputs and their statistics:

    MIN(Long.MIN_VALUE, "-oo"),
    MINUS_SMALL(-SMALL_TIMEOUT_MILLIS, "-" + SMALL_TIMEOUT_MILLIS + "ms"),
    ZERO(0L, "0ms"),
    SMALL(SMALL_TIMEOUT_MILLIS, SMALL_TIMEOUT_MILLIS + "ms"),
    LARGE(UNEXPECTED_HANG_DELAY_MILLIS * 2, (2 * UNEXPECTED_HANG_DELAY_MILLIS) + "ms"),
    MAX(Long.MAX_VALUE, "+oo");

    final long millis;
    final String label;

    Timeout(long millis, String label) {
      this.millis = millis;

 * StatsAccumulator#add} and {@link StatsAccumulator#addAll} methods. For tests of the {@link
 * StatsAccumulator#snapshot} method which returns {@link Stats} instances, see {@link StatsTest}.
 *
 * @author Pete Gillin
 */
public class StatsAccumulatorTest extends TestCase {

  private StatsAccumulator emptyAccumulator;
  private StatsAccumulator emptyAccumulatorByAddAllEmptyIterable;

import java.nio.ByteOrder;
import junit.framework.TestCase;

/**
 * Tests for {@link Stats}. This tests instances created by both {@link Stats#of} and {@link
 * StatsAccumulator#snapshot}.
 *
 * @author Pete Gillin
 */
public class StatsTest extends TestCase {

  public void testCount() {
    assertThat(EMPTY_STATS_VARARGS.count()).isEqualTo(0);
    assertThat(EMPTY_STATS_ITERABLE.count()).isEqualTo(0);

 * @author Justin T. Sampson
 */
public final class TestThread<L> extends Thread implements TearDown {

  private static final long DUE_DILIGENCE_MILLIS = 100;
  private static final long TIMEOUT_MILLIS = 5000;

  private final L lockLikeObject;

  private final SynchronousQueue<Request> requestQueue = new SynchronousQueue<>();

    MIN(Long.MIN_VALUE, "-oo"),
    MINUS_SMALL(-SMALL_TIMEOUT_MILLIS, "-" + SMALL_TIMEOUT_MILLIS + "ms"),
    ZERO(0L, "0ms"),
    SMALL(SMALL_TIMEOUT_MILLIS, SMALL_TIMEOUT_MILLIS + "ms"),
    LARGE(UNEXPECTED_HANG_DELAY_MILLIS * 2, (2 * UNEXPECTED_HANG_DELAY_MILLIS) + "ms"),
    MAX(Long.MAX_VALUE, "+oo");

    final long millis;
    final String label;

    Timeout(long millis, String label) {
      this.millis = millis;

  }

  private static class SleepingRunnable implements Runnable {
    final int millis;
    volatile boolean completed;

    public SleepingRunnable(int millis) {
      this.millis = millis;
    }

    @Override
    public void run() {
      try {
        Thread.sleep(millis);
      } catch (InterruptedException wontHappen) {
        throw new AssertionError();
      }

    assertEquals(0, ticker.read());
    assertEquals(10, ticker.read());
    assertEquals(20, ticker.read());
  }

  public void testAutoIncrementStep_millis() {
    FakeTicker ticker = new FakeTicker().setAutoIncrementStep(1, TimeUnit.MILLISECONDS);
    assertEquals(0, ticker.read());
    assertEquals(1000000, ticker.read());
    assertEquals(2000000, ticker.read());
  }