"Collection returned is unexpectedly modifiable";
  static final String ERROR_SELF_LOOP = "self-loops are not allowed";
  static final String ERROR_EDGE_NOT_IN_GRAPH =
      "Should not be allowed to pass an edge that is not an element of the graph.";
  static final String ERROR_ADDED_SELF_LOOP = "Should not be allowed to add a self-loop edge.";
  static final String ERROR_ADDED_PARALLEL_EDGE = "Should not be allowed to add a parallel edge.";

 * {@link EndpointPair} of an undirected edge is an unordered pair of nodes ({@link #nodeU()} and
 * {@link #nodeV()}).
 *
 * <p>The edge is a self-loop if, and only if, the two endpoints are equal.
 *
 * @author James Sexton
 * @since 20.0
 */
@Beta
@Immutable(containerOf = {"N"})
public abstract class EndpointPair<N> implements Iterable<N> {

    int successorCount = 0;

    for (EndpointPair<N> incidentEdge : incidentEdges) {
      if (incidentEdge.nodeU().equals(thisNode) && incidentEdge.nodeV().equals(thisNode)) {
        // incidentEdge is a self-loop

        adjacentNodeValues.put(thisNode, new PredAndSucc(successorNodeToValueFn.apply(thisNode)));

        orderedNodeConnectionsBuilder.add(new NodeConnection.Pred<>(thisNode));

  public static <K extends Comparable, V extends @Nullable Object>
      Iterable<Entry<K, V>> orderEntriesByKey(List<Entry<K, V>> insertionOrder) {
    @SuppressWarnings("unchecked") // assume any Comparable is Comparable<Self>
    Comparator<? super K> keyComparator = (Comparator<? super K>) Comparable::compareTo;
    sort(insertionOrder, entryComparator(keyComparator));
    return insertionOrder;
  }

  /**

 * @author Colin Evans
 * @since 10.0
 */
@GwtCompatible
public final class UnsignedLongs {
  private UnsignedLongs() {}

  public static final long MAX_VALUE = -1L; // Equivalent to 2^64 - 1

  /**
   * A (self-inverse) bijection which converts the ordering on unsigned longs to the ordering on
   * longs, that is, {@code a <= b} as unsigned longs if and only if {@code flip(a) <= flip(b)} as
   * signed longs.
   */

        FessTimeResourceProvider provider2 = new FessTimeResourceProvider(mockConfig);

        // Test basic object equality
        assertNotSame(provider1, provider2);
        assertEquals(provider1, provider1); // Self equality
        assertFalse(provider1.equals(null)); // Null check
        assertFalse(provider1.equals("string")); // Type check
    }

    // Test with rapid config changes

    val now = System.currentTimeMillis()
    val heldCertificate = HeldCertificate.Builder().build()
    val certificate = heldCertificate.certificate
    assertThat(certificate.getSubjectX500Principal().name, "self-signed")
      .isEqualTo(certificate.getIssuerX500Principal().name)
    assertThat(certificate.getIssuerX500Principal().name).matches(Regex("CN=[0-9a-f-]{36}"))
    assertThat(certificate.serialNumber).isEqualTo(BigInteger.ONE)

      createDirectedGraph("ab", "ac", "bd", "cd");

  /**
   * Same as {@link #DIAMOND_GRAPH}, but with an extra c->a edge and some self edges:
   *
   * {@snippet :
   *   a<>
   *  / \\
   * b   c
   *  \ /
   *   d<>
   * }
   *
   * {@code <>} indicates a self-loop
   */
  private static final SuccessorsFunction<Character> MULTI_GRAPH =
      createDirectedGraph("aa", "dd", "ab", "ac", "ca", "cd", "bd");

      createDirectedGraph("ab", "ac", "bd", "cd");

  /**
   * Same as {@link #DIAMOND_GRAPH}, but with an extra c->a edge and some self edges:
   *
   * {@snippet :
   *   a<>
   *  / \\
   * b   c
   *  \ /
   *   d<>
   * }
   *
   * {@code <>} indicates a self-loop
   */
  private static final SuccessorsFunction<Character> MULTI_GRAPH =
      createDirectedGraph("aa", "dd", "ab", "ac", "ca", "cd", "bd");

!important;\n}\n\n.align-content-stretch {\n  align-content: stretch !important;\n}\n\n.align-self-auto {\n  align-self: auto !important;\n}\n\n.align-self-start {\n  align-self: flex-start !important;\n}\n\n.align-self-end {\n  align-self: flex-end !important;\n}\n\n.align-self-center {\n  align-self: center !important;\n}\n\n.align-self-baseline {\n  align-self: baseline !important;\n}\n\n.align-self-stretch {\n  align-self: stretch !important;\n}\n\n@media (min-width: 576px) {\n  .flex-sm-row {\n    flex-direction:...