private static final IteratorTester.KnownOrder KNOWN_ORDER =
      IteratorTester.KnownOrder.KNOWN_ORDER;

  private static final Collection<Integer> EMPTY_COLLECTION = Arrays.<Integer>asList();

  private static final Collection<Integer> SOME_COLLECTION = asList(0, 1, 1);

  private static final Iterable<Integer> SOME_ITERABLE =
      new Iterable<Integer>() {
        @Override
        public Iterator<Integer> iterator() {

 * Collections.unmodifiableList}'s iterator:
 *
 * {@snippet :
 * List<String> expectedElements =
 *     Arrays.asList("a", "b", "c", "d", "e");
 * List<String> actualElements =
 *     Collections.unmodifiableList(
 *         Arrays.asList("a", "b", "c", "d", "e"));
 * IteratorTester<String> iteratorTester =
 *     new IteratorTester<String>(
 *         6,
 *         IteratorFeature.UNMODIFIABLE,

    
    // Update cache if we have a directory lease
    if (directoryLeaseManager != null && directoryLeaseKey != null) {
        directoryLeaseManager.updateDirectoryCache(getPath(), Arrays.asList(files));
    }
    
    return files;
}

@Override
public boolean exists() throws IOException {
    if (isDirectory() && directoryLeaseManager != null) {
        // Check parent directory cache first

    Multiset<String> ms1 = HashMultiset.create(asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(asList("a"));
    assertThat(difference(ms1, ms2)).containsExactly("a", "b");
  }

  public void testDifferenceWithRemovedElement() {
    Multiset<String> ms1 = HashMultiset.create(asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(asList("b"));

            final List<String> tagList = new ArrayList<>();
            final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
            if (StringUtil.isNotBlank(key)) {
                tagList.add(key);
            }
            runtime.registerData("popularWords", popularWordHelper.getWordList(SearchRequestType.SEARCH, null,
                    tagList.toArray(new String[tagList.size()]), null, null, null));

        public void init() {
            // Do nothing to avoid container access
        }

        @Override
        protected void storeQueue(List<Tuple3<String, String, String>> taskList) {
            // Override to avoid database operations
            taskList.clear();
        }

        @Override
        protected String getImageFilename(final Map<String, Object> docMap) {
            // Override to avoid null pointer issues

import static com.google.common.collect.testing.Helpers.getMethod;
import static com.google.common.collect.testing.features.FeatureUtil.addImpliedFeatures;
import static java.util.Arrays.asList;
import static java.util.Collections.disjoint;
import static java.util.Collections.unmodifiableSet;
import static java.util.logging.Level.FINER;

import com.google.common.annotations.GwtIncompatible;

      Set<Object> keys = cache.asMap().keySet();
      assertFalse(keys.remove(null));
      assertFalse(keys.remove(6));
      assertFalse(keys.remove(-6));
      assertFalse(keys.removeAll(asList(null, 0, 15, 1500)));
      assertFalse(keys.retainAll(asList(null, 0, 15, 1500)));
      checkEmpty(keys);
      checkEmpty(cache);
    }
  }

  public void testKeySet_remove() {
    for (LoadingCache<Object, Object> cache : caches()) {

        assertNotNull(second);
        // Due to round-robin, should get different channels or same order
        assertTrue(Arrays.asList(channel1, channel2).contains(first));
        assertTrue(Arrays.asList(channel1, channel2).contains(second));
    }

    @Test
    void testLeastLoadedStrategy() {
        loadBalancer.setStrategy(LoadBalancingStrategy.LEAST_LOADED);

  abstract static class CachingAsList<E> extends ImmutableSet<E> {
    @LazyInit @RetainedWith private transient @Nullable ImmutableList<E> asList;

    @Override
    public ImmutableList<E> asList() {
      ImmutableList<E> result = asList;
      if (result == null) {
        return asList = createAsList();
      } else {
        return result;
      }
    }

    ImmutableList<E> createAsList() {