checkArgument(predicate.apply(element));
      return unfiltered.add(element);
    }

    @Override
    public boolean addAll(Collection<? extends E> collection) {
      for (E element : collection) {
        checkArgument(predicate.apply(element));
      }
      return unfiltered.addAll(collection);
    }

    @Override
    public void clear() {
      Iterables.removeIf(unfiltered, predicate);
    }

    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>)

    }

    /**
     * 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() {

     *
     * @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) {

    expected.addAll(asList(elements));
    expectContents(expected);
  }

  protected final void expectAdded(int index, E... elements) {
    expectAdded(index, asList(elements));
  }

  protected final void expectAdded(int index, Collection<E> elements) {
    List<E> expected = copyToList(getSampleElements());
    expected.addAll(index, elements);
    expectContents(expected);
  }

    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;
  }

                identifiable.setSourceLevel(recessiveSourceLevel);

                identifiables.add(identifiable);
            }
        }

        dominant.addAll(0, identifiables);
    }

    /**
     * @param identifiables
     * @return a map
     */
    private static <T extends IdentifiableBase> Map<String, T> mapById(List<T> identifiables) {

        Lifecycle myLifecycle =
                new Lifecycle("etl", Arrays.asList("extract", "transform", "load"), Collections.emptyMap());
        myLifecycles.add(myLifecycle);
        myLifecycles.addAll(defaultLifeCycles.getLifeCycles());

        Map<String, Lifecycle> lifeCycles = myLifecycles.stream().collect(Collectors.toMap(Lifecycle::getId, l -> l));
        PlexusContainer mockedPlexusContainer = mock(PlexusContainer.class);

    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,

    add(element, 1);
    return true;
  }

  /**
   * A sensible definition of {@link #addAll(Collection)} in terms of {@link #add(Object)} and
   * {@link #add(Object, int)}. If you override either of these methods, you may wish to override
   * {@link #addAll(Collection)} to forward to this implementation.
   *
   * @since 7.0
   */
  @Override