if (slice && bytes.length > 0) {
      // test a random slice() of the ByteSource
      Random random = new Random();
      byte[] expected = factory.getExpected(bytes);
      // if expected.length == 0, off has to be 0 but length doesn't matter--result will be empty
      int off = expected.length == 0 ? 0 : random.nextInt(expected.length);
      int len = expected.length == 0 ? 4 : random.nextInt(expected.length - off);

  private static final int NUM_PUTS = 100_000;
  private static final ThreadLocal<Random> random =
      new ThreadLocal<Random>() {
        @Override
        protected Random initialValue() {
          return new Random();
        }
      };

  private static final int GOLDEN_PRESENT_KEY = random.get().nextInt();

  @AndroidIncompatible // OutOfMemoryError

  }

  private static final Random RANDOM = new Random(42);

  public void testLength() {
    assertThat(ImmutableLongArray.of().length()).isEqualTo(0);
    assertThat(ImmutableLongArray.of(0).length()).isEqualTo(1);
    assertThat(ImmutableLongArray.of(0, 1, 3).length()).isEqualTo(3);
    assertThat(ImmutableLongArray.of(0, 1, 3).subArray(1, 1).length()).isEqualTo(0);

  }

  private static final Random RANDOM = new Random(42);

  public void testLength() {
    assertThat(ImmutableDoubleArray.of().length()).isEqualTo(0);
    assertThat(ImmutableDoubleArray.of(0).length()).isEqualTo(1);
    assertThat(ImmutableDoubleArray.of(0, 1, 3).length()).isEqualTo(3);
    assertThat(ImmutableDoubleArray.of(0, 1, 3).subArray(1, 1).length()).isEqualTo(0);

   * [acquire(5), acquire(1)] takes exactly the same time as [acquire(2), acquire(3), acquire(1)].
   */
  public void testTimeToWarmUpIsHonouredEvenWithWeights() {
    Random random = new Random();
    int warmupPermits = 10;
    double[] coldFactorsToTest = {2.0, 3.0, 10.0};
    double[] qpsToTest = {4.0, 2.0, 1.0, 0.5, 0.1};
    for (int trial = 0; trial < 100; trial++) {

      }
    }
  }

  @GwtIncompatible // Too slow in GWT (~3min fully optimized)
  public void testDivideRemainderEuclideanProperty() {
    // Use a seed so that the test is deterministic:
    Random r = new Random(0L);
    for (int i = 0; i < 1000000; i++) {
      int dividend = r.nextInt();
      int divisor = r.nextInt();
      // Test that the Euclidean property is preserved:
      assertThat(
              dividend

 * limitations under the License.
 */

package com.google.common.util.concurrent;

import com.google.common.testing.NullPointerTester;
import com.google.common.testing.TearDownStack;
import java.util.Random;
import junit.framework.TestCase;

/**
 * Tests for {@link Monitor}, either interruptible or uninterruptible.
 *
 * @author Justin T. Sampson
 */
public abstract class MonitorTestCase extends TestCase {

    ArbitraryInstances.get(Stopwatch.class).start();
    assertNotNull(ArbitraryInstances.get(Ticker.class));
    assertFreshInstanceReturned(Random.class);
    assertEquals(
        ArbitraryInstances.get(Random.class).nextInt(),
        ArbitraryInstances.get(Random.class).nextInt());
  }

  public void testGet_concurrent() {
    assertTrue(ArbitraryInstances.get(BlockingDeque.class).isEmpty());

    utf8Lengths.put(MIN_SUPPLEMENTARY_CODE_POINT, 4);
    utf8Lengths.put(MAX_CODE_POINT, 4);

    Integer[] codePoints = utf8Lengths.keySet().toArray(new Integer[] {});
    StringBuilder sb = new StringBuilder();
    Random rnd = new Random();
    for (int trial = 0; trial < 100; trial++) {
      sb.setLength(0);
      int utf8Length = 0;
      for (int i = 0; i < 6; i++) {
        Integer randomCodePoint = codePoints[rnd.nextInt(codePoints.length)];

    assertThat(Shorts.fromBytes((byte) 0xFE, (byte) 0xDC)).isEqualTo((short) 0xFEDC);
  }

  @GwtIncompatible // Shorts.fromByteArray, Shorts.toByteArray
  public void testByteArrayRoundTrips() {
    Random r = new Random(5);
    byte[] b = new byte[Shorts.BYTES];

    // total overkill, but, it takes 0.1 sec so why not...
    for (int i = 0; i < 10000; i++) {
      short num = (short) r.nextInt();