assertEquals("FFFF", Hexdump.toHexString(-1, 4));
        assertEquals("FF", Hexdump.toHexString(-1, 2));
    }

    @Test
    @DisplayName("Should convert long to hex string with specified size")
    void testToHexStringLong() {
        // Test zero
        assertEquals("0000000000000000", Hexdump.toHexString(0L, 16));
        assertEquals("00000000", Hexdump.toHexString(0L, 8));

            Long expiration = System.currentTimeMillis() + 10000L;
            echoResponse.setExpiration(expiration);

            assertEquals(expiration, echoResponse.getExpiration());
        }

        @Test
        @DisplayName("Should handle null expiration")
        void testNullExpiration() {
            Long expiration = 1000L;

        }
        if (StringUtil.isNotBlank(relatedQueryPager.queries)) {
            cb.query().setQueries_Wildcard(wrapQuery(relatedQueryPager.queries));
        }
        // TODO Long, Integer, String supported only.

        // setup condition
        cb.query().addOrderBy_Term_Asc();
        cb.query().addOrderBy_CreatedTime_Asc();

        // search

    }

  Closeable {
  val pool = factory.newConnectionPool(routePlanner = this)
  val events = LinkedBlockingDeque<String>()
  var canceled = false
  var autoGeneratePlans = false
  var defaultConnectionIdleAtNanos = Long.MAX_VALUE
  private var nextPlanId = 0
  private var nextPlanIndex = 0
  val plans = mutableListOf<FakePlan>()

  override val deferredPlans = ArrayDeque<RoutePlanner.Plan>()

   * of the same class. For example, if sublists of {@code MyList} instances were serializable,
   * those sublists might implement a private {@code MySubList} type but serialize as a plain {@code
   * MyList} to save space. So long as {@code MyList} has all the public supertypes of {@code
   * MySubList}, this is safe. For these cases, for which {@code reserializeAndAssert} is too
   * strict, use {@link #reserialize}.
   *

            return true; // BAD!!
          }

          @Override
          public String get() {
            return "foo"; // BAD!!
          }

          @Override
          public String get(long time, TimeUnit unit) {
            return "foo"; // BAD!!
          }

          @Override
          public void addListener(Runnable runnable, Executor executor) {
            executor.execute(runnable);

            return true; // BAD!!
          }

          @Override
          public String get() {
            return "foo"; // BAD!!
          }

          @Override
          public String get(long time, TimeUnit unit) {
            return "foo"; // BAD!!
          }

          @Override
          public void addListener(Runnable runnable, Executor executor) {
            executor.execute(runnable);

    return super.toArray();
  }

  @Override
  public <T> T[] toArray(T[] a) {
    assertTrue(Thread.holdsLock(mutex));
    return super.toArray(a);
  }

  private static final long serialVersionUID = 0;

   * {@code new ImmutableMapEntry[...]}, so it seems silly to insist on that only here.
   */
  @SuppressWarnings("unchecked") // Safe as long as the javadocs are followed
  static <K, V> ImmutableMapEntry<K, V>[] createEntryArray(int size) {
    return (ImmutableMapEntry<K, V>[]) new ImmutableMapEntry<?, ?>[size];
  }

  ImmutableMapEntry(K key, V value) {

    assertEquals(
        Integer.MAX_VALUE,
        Collections2.orderedPermutations(newArrayList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13))
            .size());
    // 21 elements overflow a long
    assertEquals(
        Integer.MAX_VALUE,
        Collections2.orderedPermutations(
                newArrayList(
                    1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21))