builder.interceptors().addAll(listOf(null) as List<Interceptor>)
    assertFailsWith<IllegalStateException> {
      builder.build()
    }.also { expected ->
      assertThat(expected.message).isEqualTo("Null interceptor: [null]")
    }
  }

  @Test fun nullNetworkInterceptorInList() {
    val builder = OkHttpClient.Builder()
    builder.networkInterceptors().addAll(listOf(null) as List<Interceptor>)

    for (K k : sampleKeys()) {
      resetContainer();

      Set<V> expectedValues = copyToSet(multimap().get(k));

      multimap().putAll(k, valuesToPut);
      expectedValues.addAll(valuesToPut);

      assertGet(k, expectedValues);
    }
  }

   */
  public static <E extends @Nullable Object> HashMultiset<E> create(
      Iterable<? extends E> elements) {
    HashMultiset<E> multiset = create(Multisets.inferDistinctElements(elements));
    Iterables.addAll(multiset, elements);
    return multiset;
  }

  private HashMultiset() {
    super(new HashMap<E, Count>());
  }

  private HashMultiset(int distinctElements) {

    List<E> list = new ArrayList<>();
    addAll(list, elements);
    return list;
  }

  public static <E extends @Nullable Object> List<E> copyToList(E[] elements) {
    return copyToList(asList(elements));
  }

  // Clone of Sets.newLinkedHashSet
  public static <E extends @Nullable Object> Set<E> copyToSet(Iterable<? extends E> elements) {
    Set<E> set = new LinkedHashSet<>();
    addAll(set, elements);
    return set;
  }

     *
     * @param c the collection to copy from
     */
    public CaseInsensitiveSet(final Collection<String> c) {
        map = new CaseInsensitiveMap<>(Math.max((int) (c.size() / .75f) + 1, 16));
        addAll(c);
    }

    /**
     * Creates a {@link CaseInsensitiveSet}.
     *
     * @param initialCapacity the initial capacity
     */
    public CaseInsensitiveSet(final int initialCapacity) {

    val expectedEvents2 =
      mutableListOf<String>().apply {
        add("CallStart")
        if (connectionType != H2) {
          addAll(listOf("ConnectStart", "ConnectEnd"))
        }
        addAll(listOf("ConnectionAcquired", "ConnectionReleased", "CallEnd"))
      }

    assertThat(events2).isEqualTo(expectedEvents2)
  }

  private fun isConnectionEvent(it: CallEvent?) =

    }

    /**
     * Adds an authentication chain to the manager.
     * @param chain The authentication chain to add.
     */
    public void addChain(final AuthenticationChain chain) {
        chains = ArrayUtils.addAll(chains, chain);
    }

    /**
     * Returns a stream of authentication chains.
     * @return A stream wrapper of the authentication chains.
     */
    protected StreamOf<AuthenticationChain> chains() {

    checkConflict("absent", absentFeatures, "present", morePresentFeatures, source);
    checkConflict("present", presentFeatures, "absent", moreAbsentFeatures, source);
    presentFeatures.addAll(morePresentFeatures);
    absentFeatures.addAll(moreAbsentFeatures);
    return requirements;
  }

  // Used by incorporateRequirements() only
  private static void checkConflict(
      String earlierRequirement,

                            }
                            if (!hasAccessToken || roleSet.isEmpty()) {
                                roleSet.addAll(fessConfig.getSearchGuestRoleList());
                            }
                        });
            } catch (final RuntimeException e) {
                try {

    checkConflict("absent", absentFeatures, "present", morePresentFeatures, source);
    checkConflict("present", presentFeatures, "absent", moreAbsentFeatures, source);
    presentFeatures.addAll(morePresentFeatures);
    absentFeatures.addAll(moreAbsentFeatures);
    return requirements;
  }

  // Used by incorporateRequirements() only
  private static void checkConflict(
      String earlierRequirement,