for (int i = 0; i < 10; i++) {
          assertEquals(unfiltered.lower(i), filtered.lower(i));
          assertEquals(unfiltered.floor(i), filtered.floor(i));
          assertEquals(unfiltered.ceiling(i), filtered.ceiling(i));
          assertEquals(unfiltered.higher(i), filtered.higher(i));
        }
      }
    }
  }

  private FilteredCollectionsTestUtil() {}

  }

  private TestSuite filterSuite(TestSuite suite) {
    TestSuite filtered = new TestSuite(suite.getName());
    Enumeration<?> tests = suite.tests();
    while (tests.hasMoreElements()) {
      Test test = (Test) tests.nextElement();
      if (matches(test)) {
        filtered.addTest(test);
      }
    }
    return filtered;
  }

      Multiset<E> unfiltered, Predicate<? super E> predicate) {
    if (unfiltered instanceof FilteredMultiset) {
      // Support clear(), removeAll(), and retainAll() when filtering a filtered
      // collection.
      FilteredMultiset<E> filtered = (FilteredMultiset<E>) unfiltered;
      Predicate<E> combinedPredicate = Predicates.and(filtered.predicate, predicate);

      Multiset<E> unfiltered, Predicate<? super E> predicate) {
    if (unfiltered instanceof FilteredMultiset) {
      // Support clear(), removeAll(), and retainAll() when filtering a filtered
      // collection.
      FilteredMultiset<E> filtered = (FilteredMultiset<E>) unfiltered;
      Predicate<E> combinedPredicate = Predicates.and(filtered.predicate, predicate);

	for diskIndex, disk := range erasureDisks {
		if diskIndex == 0 && disk != nil {
			t.Errorf("Drive not filtered as expected, drive: %d", diskIndex)
		}
		if diskIndex != 0 && disk == nil {
			t.Errorf("Drive erroneously filtered, driveIndex: %d", diskIndex)
		}
	}
	partsMetadata[0] = partsMetadataBackup // Revert before going to the next test

	// Test 3: Not synchronized DataDir

    multimap.put("baz", 3);
    multimap.put("bar", 4);

    SetMultimap<String, Integer> filtered =
        filterKeys(multimap, Predicates.in(ImmutableSet.of("foo", "bar")));

    assertEquals(ImmutableSet.of(), filtered.replaceValues("baz", ImmutableSet.<Integer>of()));

    assertThrows(
        IllegalArgumentException.class, () -> filtered.replaceValues("baz", ImmutableSet.of(5)));
  }

  }

  private TestSuite filterSuite(TestSuite suite) {
    TestSuite filtered = new TestSuite(suite.getName());
    Enumeration<?> tests = suite.tests();
    while (tests.hasMoreElements()) {
      Test test = (Test) tests.nextElement();
      if (matches(test)) {
        filtered.addTest(test);
      }
    }
    return filtered;
  }

   */
  public static <E extends @Nullable Object> Collection<E> filter(
      Collection<E> unfiltered, Predicate<? super E> predicate) {
    if (unfiltered instanceof FilteredCollection) {
      // Support clear(), removeAll(), and retainAll() when filtering a filtered
      // collection.
      return ((FilteredCollection<E>) unfiltered).createCombined(predicate);
    }

      for (Object o : elements) {
        if (o == null) {
          throw new NullPointerException();
        }
      }

      // prepare extreme values to be filtered out of view
      E firstExclusive = delegate.belowSamplesGreater();
      E lastExclusive = delegate.aboveSamplesLesser();
      if (from != Bound.NO_BOUND) {
        extremeValues.add(delegate.belowSamplesLesser());

   */

  public void testFilter() {
    FluentIterable<String> filtered =
        FluentIterable.from(asList("foo", "bar")).filter(equalTo("foo"));

    List<String> expected = singletonList("foo");
    List<String> actual = Lists.newArrayList(filtered);
    assertEquals(expected, actual);
    assertCanIterateAgain(filtered);
    assertEquals("[foo]", filtered.toString());
  }

  private static class TypeA {}