checkNotNull(optionals.iterator());

          @Override
          protected @Nullable T computeNext() {
            while (iterator.hasNext()) {
              Optional<? extends T> optional = iterator.next();
              if (optional.isPresent()) {
                return optional.get();
              }
            }
            return endOfData();

   */
  public static <E> ImmutableList<E> copyOf(Iterator<? extends E> elements) {
    // We special-case for 0 or 1 elements, but going further is madness.
    if (!elements.hasNext()) {
      return of();
    }
    E first = elements.next();
    if (!elements.hasNext()) {
      return of(first);
    } else {
      return new ImmutableList.Builder<E>().add(first).addAll(elements).build();
    }
  }

  /**

        return closed(set.first(), set.last());
      }
    }
    Iterator<C> valueIterator = values.iterator();
    C min = checkNotNull(valueIterator.next());
    C max = min;
    while (valueIterator.hasNext()) {
      C value = checkNotNull(valueIterator.next());
      min = Ordering.<C>natural().min(min, value);
      max = Ordering.<C>natural().max(max, value);
    }
    return closed(min, max);
  }

              countMap.entrySet().iterator();

          @Override
          protected @Nullable Entry<E> computeNext() {
            while (true) {
              if (!mapEntries.hasNext()) {
                return endOfData();
              }
              Map.Entry<E, AtomicInteger> mapEntry = mapEntries.next();
              int count = mapEntry.getValue().get();
              if (count != 0) {

    assertEquals(0, (int) numberOrdering.min(iterator));
    assertFalse(iterator.hasNext());
  }

  public void testIteratorMaxExhaustsIterator() {
    List<Integer> ints = Lists.newArrayList(9, 0, 3, 5);
    Iterator<Integer> iterator = ints.iterator();
    assertEquals(9, (int) numberOrdering.max(iterator));
    assertFalse(iterator.hasNext());
  }

  public void testIterableMinAndMax() {

    assertEquals(0, (int) numberOrdering.min(iterator));
    assertFalse(iterator.hasNext());
  }

  public void testIteratorMaxExhaustsIterator() {
    List<Integer> ints = Lists.newArrayList(9, 0, 3, 5);
    Iterator<Integer> iterator = ints.iterator();
    assertEquals(9, (int) numberOrdering.max(iterator));
    assertFalse(iterator.hasNext());
  }

  public void testIterableMinAndMax() {

        }

        final String baseName = toDirectoryName(rootPackage);
        final List<Traverser> list = newArrayList();
        for (final Iterator<URL> it = ClassLoaderUtil.getResources(baseName); it.hasNext();) {
            final URL url = it.next();
            final Traverser resourcesType = getTraverser(url, rootPackage, baseName);
            if (resourcesType != null) {
                list.add(resourcesType);

  }

  @Override
  public @Nullable K lastKey() {
    return sortedDelegate.lastKey();
  }

  @Nullable K higher(K k) {
    Iterator<K> iterator = keySet().tailSet(k).iterator();
    while (iterator.hasNext()) {
      K tmp = iterator.next();
      if (comparator().compare(k, tmp) < 0) {
        return tmp;
      }
    }
    return null;
  }

  @Override

            // Test with concrete implementation
            assertDoesNotThrow(() -> concreteImplementation.replaceCache());
        }

        @Test
        @DisplayName("Should check if resolve hashes")
        void testIsResolveHashes() {
            // Test with mock
            when(mockReferralData.isResolveHashes()).thenReturn(true);
            assertTrue(mockReferralData.isResolveHashes());

        protected int last = -1;

        /**
         * Constructs an instance.
         */
        protected ArrayMapIterator() {
        }

        @Override
        public boolean hasNext() {
            return current != size;
        }

        @Override
        public Entry<K, V> next() {
            try {
                final Entry<K, V> n = listTable[current];