List<@Nullable Integer> values = Arrays.asList(1, null);
    assertThrows(
        NullPointerException.class,
        () -> Multimaps.index((List<Integer>) values, Functions.identity()));
  }

  public void testIndex_nullKey() {
    List<Integer> values = Arrays.asList(1, 2);
    assertThrows(
        NullPointerException.class, () -> Multimaps.index(values, Functions.constant(null)));
  }

    return new SampleElements<>("January", "February", "March", "April", "May");
  }

  @Override
  public Collection<String> createCollection(Iterable<? extends String> values) {
    return copyToList(values);
  }

  @Override
  public final ListMultimap<String, String> create(Object... entries) {
    @SuppressWarnings("unchecked")

    return new SampleElements<>("January", "February", "March", "April", "May");
  }

  @Override
  public Collection<String> createCollection(Iterable<? extends String> values) {
    return copyToSet(values);
  }

  @Override
  public final SetMultimap<String, String> create(Object... entries) {
    @SuppressWarnings("unchecked")

    } catch (RuntimeException tolerated) {
      // GWT's TreeMap.values().removeAll(null) doesn't throws NPE.
    }
  }

  @Override
  public void testValuesRetainAllNullFromEmpty() {
    try {
      super.testValuesRemoveAllNullFromEmpty();
    } catch (RuntimeException tolerated) {
      // GWT's TreeMap.values().retainAll(null) doesn't throws NPE.
    }
  }

  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE})
  public void testReplaceValuesHandlesDuplicates() {
    List<V> values = asList(v0(), v1(), v0());

    for (K k : sampleKeys()) {
      resetContainer();
      multimap().replaceValues(k, values);
      assertGet(k, v0(), v1());
    }
  }

            handlePhantomReference(ref);
        }

        // Check for old unclosed resources
        long now = System.currentTimeMillis();
        for (ResourceHolder holder : activeResources.values()) {
            if (!holder.closed && holder.getAge() > maxResourceAge) {
                reportPotentialLeak(holder);
            }
        }
    }

    /**

                response.readBytesWireFormat(buffer, 0);
            }, "Expected structureSize = 17");
        }

        @ParameterizedTest
        @DisplayName("Should read various count values")
        @ValueSource(ints = { 0, 1, 100, 1024, 65536, Integer.MAX_VALUE })
        void testReadVariousCountValues(int count) throws SMBProtocolDecodingException {
            byte[] buffer = createValidWriteResponse(count, 0);

                    Arrays.toString(ValidationReportLevel.values()));
            logger.warn("");
        }
    }

    private boolean hasAnythingToReport(
            Map<String, PluginValidationIssues> issuesMap, EnumSet<IssueLocality> issueLocalitiesToReport) {
        for (PluginValidationIssues issues : issuesMap.values()) {

    int hashBits = function.bits();

    // output loop tests input bit
    for (int i = 0; i < keyBits; i++) {
      int same = 0x0; // bitset for output bits with same values
      int diff = 0x0; // bitset for output bits with different values
      int count = 0;
      // originally was 2 * Math.log(...), making it try more times to avoid flakiness issues
      int maxCount = (int) (4 * Math.log(2 * keyBits * hashBits) + 1);

    return new SampleElements<>("January", "February", "March", "April", "May");
  }

  @Override
  public Collection<String> createCollection(Iterable<? extends String> values) {
    return copyToList(values);
  }

  @Override
  public final ListMultimap<String, String> create(Object... entries) {
    @SuppressWarnings("unchecked")