}
  }

  public void testSize0() {
    Iterator<String> iterator = Iterators.emptyIterator();
    assertEquals(0, Iterators.size(iterator));
  }

  public void testSize1() {
    Iterator<Integer> iterator = Collections.singleton(0).iterator();
    assertEquals(1, Iterators.size(iterator));
  }

  public void testSize_partiallyConsumed() {

  }

  public void testNewEnumSet_collection() {
    Set<SomeEnum> set = ImmutableSet.of(SomeEnum.B, SomeEnum.C);
    assertEquals(set, newEnumSet(set, SomeEnum.class));
  }

  public void testNewEnumSet_iterable() {
    Set<SomeEnum> set = ImmutableSet.of(SomeEnum.A, SomeEnum.B, SomeEnum.C);
    assertEquals(set, newEnumSet(unmodifiableIterable(set), SomeEnum.class));
  }

  public void testNewHashSetEmpty() {

 * }
 * }</pre>
 *
 * <p>so that a hypothetical bad caller of this method, such as:
 *
 * <pre>{@code
 * void exampleBadCaller() {
 *   double d = sqrt(-1.0);
 * }
 * }</pre>
 *
 * <p>would be flagged as having called {@code sqrt()} with an illegal argument.
 *
 * <h3>Performance</h3>
 *
 * <p>Avoid passing message arguments that are expensive to compute; your code will always compute

    logHandler.clear();
    return logRecord.getThrown();
  }

  private void checkNothingLogged() {
    assertThat(logHandler.getStoredLogRecords()).isEmpty();
  }

  private void checkLoggedCause(Throwable t) {
    assertThat(popLoggedThrowable()).hasCauseThat().isSameInstanceAs(t);
  }

  private void checkLoggedInvalidLoad() {
    assertThat(popLoggedThrowable()).isInstanceOf(InvalidCacheLoadException.class);

  @SuppressWarnings("IdentityHashMapBoxing")
  public void testIdentityHashMap() {
    IdentityHashMap<Integer, Integer> map = Maps.newIdentityHashMap();
    assertEquals(Collections.emptyMap(), map);
  }

  public void testConcurrentMap() {
    ConcurrentMap<Integer, Integer> map = Maps.newConcurrentMap();
    assertEquals(Collections.emptyMap(), map);
  }

  public void testTreeMap() {

  @SuppressWarnings("IdentityHashMapBoxing")
  public void testIdentityHashMap() {
    IdentityHashMap<Integer, Integer> map = Maps.newIdentityHashMap();
    assertEquals(Collections.emptyMap(), map);
  }

  public void testConcurrentMap() {
    ConcurrentMap<Integer, Integer> map = Maps.newConcurrentMap();
    assertEquals(Collections.emptyMap(), map);
  }

  public void testTreeMap() {

    logHandler.clear();
    return logRecord.getThrown();
  }

  private void checkNothingLogged() {
    assertThat(logHandler.getStoredLogRecords()).isEmpty();
  }

  private void checkLoggedCause(Throwable t) {
    assertThat(popLoggedThrowable()).hasCauseThat().isSameInstanceAs(t);
  }

  private void checkLoggedInvalidLoad() {
    assertThat(popLoggedThrowable()).isInstanceOf(InvalidCacheLoadException.class);

   * the given future (if available).
   */
  final void maybePropagateCancellationTo(@CheckForNull Future<?> related) {
    if (related != null & isCancelled()) {
      related.cancel(wasInterrupted());
    }
  }

  /** Releases all threads in the {@link #waiters} list, and clears the list. */
  private void releaseWaiters() {
    Waiter head = ATOMIC_HELPER.gasWaiters(this, Waiter.TOMBSTONE);

    assertStillOpen(closeable1);
  }

  public void testFrom_failedInput() throws Exception {
    assertFinallyFailsWithException(failedClosingFuture());
  }

  public void testFrom_cancelledInput() throws Exception {
    assertBecomesCanceled(ClosingFuture.from(immediateCancelledFuture()));
  }

  public void testEventuallyClosing() throws Exception {
    ClosingFuture<String> closingFuture =

    abstract T returningT();

    abstract void acceptT(T t);

    abstract <X extends T> X returningX();

    abstract <X> void acceptX(X x);

    abstract <T2 extends Enum<T2> & CharSequence> T2 returningT2();

    abstract <T2 extends CharSequence & Iterable<T2>> void acceptT2(T2 t2);

    static void verifyConsistentRawType() {