assertEquals(size + 1, multimap().size());
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
  public void testPutNullValue_unsupported() {
    assertThrows(NullPointerException.class, () -> multimap().put(k1(), null));

    expectUnchanged();
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS})
  public void testPutNullKey() {
    int size = getNumElements();

    }

    public void test_stackTrace() {
        // Test that stack trace is properly preserved
        String message = "GSA error with stack trace";
        Throwable cause = new NullPointerException("NPE occurred");
        GsaConfigException exception = new GsaConfigException(message, cause);

        assertNotNull(exception.getStackTrace());
        assertTrue(exception.getStackTrace().length > 0);

    assertEquals(0, getMultiset().remove(null, 2));
  }

  @CollectionFeature.Require(value = SUPPORTS_REMOVE, absent = ALLOWS_NULL_QUERIES)
  public void testRemove_nullForbidden() {
    assertThrows(NullPointerException.class, () -> getMultiset().remove(null, 2));
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemoveAllIgnoresCount() {
    initThreeCopies();

    assertEquals(0, getMultiset().remove(null, 2));
  }

  @CollectionFeature.Require(value = SUPPORTS_REMOVE, absent = ALLOWS_NULL_QUERIES)
  public void testRemove_nullForbidden() {
    assertThrows(NullPointerException.class, () -> getMultiset().remove(null, 2));
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemoveAllIgnoresCount() {
    initThreeCopies();

   *       input is not guaranteed to be restricted to the Basic Multilingual Plane (BMP).
   * </ul>
   *
   * @param string the literal string to be escaped
   * @return the escaped form of {@code string}
   * @throws NullPointerException if {@code string} is null
   * @throws IllegalArgumentException if {@code string} contains badly formed UTF-16 or cannot be
   *     escaped for any other reason
   */
  public abstract String escape(String string);

   *
   * @param collection a collection of {@code Number} instances
   * @return an array containing the same values as {@code collection}, in the same order, converted
   *     to primitives
   * @throws NullPointerException if {@code collection} or any of its elements is null
   * @since 1.0 (parameter was {@code Collection<Float>} before 12.0)
   */
  public static float[] toArray(Collection<? extends Number> collection) {

    }
    return false;
  }

  /**
   * Returns {@code element} cast to {@code E}, if it actually is a nonnull E. Otherwise, throws
   * either a NullPointerException or a ClassCastException as appropriate.
   */
  private void checkIsE(Object element) {
    checkNotNull(element);
    if (!isActuallyE(element)) {

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        when(mockConfig.getNetbiosScope()).thenReturn(null);
        // Configure OEM encoding to avoid NullPointerException
        when(mockConfig.getOemEncoding()).thenReturn("UTF-8");
    }

    @Test
    @DisplayName("Constructor with Configuration only should create empty Name instances")
    void testConstructorWithConfigOnly() {

            assertTrue(UniAddress.isDotQuadIP("999.999.999.999"));
        }

        @Test
        void shouldThrowExceptionForNullInput() {
            assertThrows(NullPointerException.class, () -> UniAddress.isDotQuadIP(null));
        }

        @Test
        void shouldThrowExceptionForEmptyInput() {
            assertThrows(StringIndexOutOfBoundsException.class, () -> UniAddress.isDotQuadIP(""));

        // This test verifies that when the system property is null, the handler
        // falls back to using default handlers without throwing NullPointerException.
        System.clearProperty("java.protocol.handler.pkgs");
        setupMockProtocolHandlers();
        URL url = new URL("http://example.com/resource");