assertEquals(
        "next() should still return first element after peeking", "A", peekingIterator.next());

    assertEquals("Should be able to peek() at middle element", "B", peekingIterator.peek());
    assertEquals(
        "Should be able to peek() middle element multiple times", "B", peekingIterator.peek());
    assertEquals(

            }
          }
        };

    assertEquals(0, (int) iter.peek());
    assertEquals(0, (int) iter.peek());
    assertTrue(iter.hasNext());
    assertEquals(0, (int) iter.peek());
    assertEquals(0, (int) iter.next());

    assertEquals(1, (int) iter.peek());
    assertEquals(1, (int) iter.next());

    /*
     * We test peek() after various calls to make sure that one bad call doesn't interfere with its

    assertEquals(3, (int) mmHeap.pollLast());
    assertEquals(1, (int) mmHeap.peek());
    assertEquals(2, (int) mmHeap.peekLast());
    assertEquals(2, (int) mmHeap.pollLast());
    assertEquals(1, (int) mmHeap.peek());
    assertEquals(1, (int) mmHeap.peekLast());
    assertEquals(1, (int) mmHeap.pollLast());
    assertNull(mmHeap.peek());
    assertNull(mmHeap.peekLast());
    assertNull(mmHeap.pollLast());
  }

    segment.readCount.incrementAndGet();
    segment.count = 1;
    segment.totalWeight = 1;

    assertSame(entry, table.get(0));
    assertSame(entry, segment.accessQueue.peek());
    assertSame(entry, segment.writeQueue.peek());

    segment.clear();
    assertNull(table.get(0));
    assertTrue(segment.accessQueue.isEmpty());
    assertTrue(segment.writeQueue.isEmpty());

                  .iterator());
      Cut<C> cut;
      if (positiveItr.hasNext()) {
        cut =
            (positiveItr.peek().upperBound == Cut.<C>aboveAll())
                ? positiveItr.next().lowerBound
                : positiveRangesByLowerBound.higherKey(positiveItr.peek().upperBound);
      } else if (!complementLowerBoundWindow.contains(Cut.belowAll())

    Iterator<String> nonpeek = Lists.newArrayList("a", "b", "c").iterator();
    PeekingIterator<String> peek = Iterators.peekingIterator(nonpeek);
    assertNotSame(peek, nonpeek);
    assertSame(peek, Iterators.peekingIterator(peek));
    assertSame(peek, Iterators.peekingIterator((Iterator<String>) peek));
  }

    Iterator<String> nonpeek = Lists.newArrayList("a", "b", "c").iterator();
    PeekingIterator<String> peek = Iterators.peekingIterator(nonpeek);
    assertNotSame(peek, nonpeek);
    assertSame(peek, Iterators.peekingIterator(peek));
    assertSame(peek, Iterators.peekingIterator((Iterator<String>) peek));
  }

   *     Iterators.peekingIterator(Iterators.forArray("a", "b"));
   * String a1 = peekingIterator.peek(); // returns "a"
   * String a2 = peekingIterator.peek(); // also returns "a"
   * String a3 = peekingIterator.next(); // also returns "a"
   * }
   *
   * <p>Any structural changes to the underlying iteration (aside from those performed by the
   * iterator's own {@link PeekingIterator#remove()} method) will leave the iterator in an undefined

    Iterator<Integer> consumingIterator = Iterables.consumingIterable(queue).iterator();

    assertEquals(5, queue.peek().intValue());
    assertEquals(5, consumingIterator.next().intValue());

    assertEquals(14, queue.peek().intValue());
    assertTrue(consumingIterator.hasNext());
    assertTrue(queue.isEmpty());
  }

  public void testConsumingIterable_noIteratorCall() {

    Iterator<Integer> consumingIterator = Iterables.consumingIterable(queue).iterator();

    assertEquals(5, queue.peek().intValue());
    assertEquals(5, consumingIterator.next().intValue());

    assertEquals(14, queue.peek().intValue());
    assertTrue(consumingIterator.hasNext());
    assertTrue(queue.isEmpty());
  }

  public void testConsumingIterable_noIteratorCall() {