* improving performance for repeated calls with the same input.
     *
     * @param callback The original function to be memoized. It takes a String as input and returns a String.
     * @return A new {@code UnaryOperator<String>} that caches the results of the original function.

    super(false, false, false, false);
  }

  @Override
  Table<Integer, String, Character> makeTable() {
    Table<Integer, String, Character> original = HashBasedTable.create();
    return unmodifiableTable(original);
  }

  @Override
  protected Map<String, Map<Integer, Character>> makePopulatedMap() {
    Table<Integer, String, Character> table = HashBasedTable.create();

    assertEquals(multimap().keySet(), multimap().keys().elementSet());
  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testKeysRemove() {
    int original = multimap().keys().remove(k0(), 1);
    assertEquals(max(original - 1, 0), multimap().get(k0()).size());
  }

  @CollectionSize.Require(ONE)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  public void testKeysEntrySetIteratorRemove() {

              "estimated size of spliterator after trySplit (%s) is larger than original size (%s)",
              spliterator.estimateSize(), originalSize));
    }
    if (trySplit != null) {
      if (trySplit.estimateSize() > originalSize) {
        fail(
            format(
                "estimated size of trySplit result (%s) is larger than original size (%s)",
                trySplit.estimateSize(), originalSize));
      }

              "estimated size of spliterator after trySplit (%s) is larger than original size (%s)",
              spliterator.estimateSize(), originalSize));
    }
    if (trySplit != null) {
      if (trySplit.estimateSize() > originalSize) {
        fail(
            format(
                "estimated size of trySplit result (%s) is larger than original size (%s)",
                trySplit.estimateSize(), originalSize));
      }

   * original transformation and its inverse to a value gives you the original value give-or-take
   * numerical errors. Calling this method multiple times on the same instance will always return
   * the same instance. Calling this method on the result of calling this method on an instance will
   * always return that original instance.
   */
  public abstract LinearTransformation inverse();

            assertNull(copySubj, "Clone should also return null when original has null cached subject");

            // Refresh should not break anything
            orig.refresh();
            copy.refresh();

            // Both should still return null
            assertNull(orig.getSubject(), "Original should still return null after refresh");

    assertEquals(multimap().keySet(), multimap().keys().elementSet());
  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testKeysRemove() {
    int original = multimap().keys().remove(k0(), 1);
    assertEquals(max(original - 1, 0), multimap().get(k0()).size());
  }

  @CollectionSize.Require(ONE)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  public void testKeysEntrySetIteratorRemove() {

        // Test that the exception is serializable
        DictionaryExpiredException original = new DictionaryExpiredException();

        // Serialize
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(original);
        oos.close();

        // Deserialize

        assertEquals(TimeZone.getDefault(), result);
    }

    // Test getRequestedTimeZone() with different default time zone
    public void test_getRequestedTimeZone_withDifferentDefaultTimeZone() {
        // Store original time zone
        TimeZone originalTimeZone = TimeZone.getDefault();

        try {
            // Change default time zone temporarily
            TimeZone newTimeZone = TimeZone.getTimeZone("America/New_York");