assertThrows(NullPointerException.class, () -> getMap().replace(k0(), v0(), null));
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUE_QUERIES)
  @CollectionSize.Require(absent = ZERO)
  public void testReplaceEntry_wrongValueNullValueUnsupported() {
    try {
      assertFalse(getMap().replace(k0(), v3(), null));
    } catch (NullPointerException tolerated) {

    assertThrows(NullPointerException.class, () -> getMap().replace(k0(), v0(), null));
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUE_QUERIES)
  @CollectionSize.Require(absent = ZERO)
  public void testReplaceEntry_wrongValueNullValueUnsupported() {
    try {
      assertFalse(getMap().replace(k0(), v3(), null));
    } catch (NullPointerException tolerated) {

 */
abstract class EndpointPairIterator<N> extends AbstractIterator<EndpointPair<N>> {
  private final BaseGraph<N> graph;
  private final Iterator<N> nodeIterator;

  @Nullable N node = null; // null is safe as an initial value because graphs don't allow null nodes

  Iterator<N> successorIterator = ImmutableSet.<N>of().iterator();

  static <N> EndpointPairIterator<N> of(BaseGraph<N> graph) {

        String msg = req.getHeader("Authorization");
        if (msg != null && msg.startsWith("NTLM ")) {
            final byte[] src = Base64.decode(msg.substring(5));
            if (src[8] == 1) {
                final Type1Message type1 = new Type1Message(src);
                final Type2Message type2 = new Type2Message(tc, type1, challenge, null);
                msg = new String(Base64.encode(type2.toByteArray()), "US-ASCII");

     */
    @Test
    void testReadDataWireFormat_withNullPipeIn() {
        mockPipe.pipeIn = null;
        byte[] buffer = new byte[10];
        int len = 10;
        int result = response.readDataWireFormat(buffer, 0, len);
        assertEquals(len, result, "readDataWireFormat should return the length when pipeIn is null.");
    }

    /**

                Arguments.of(new byte[] { 0x0A, 0x0B }, new byte[] { 0x0A, 0x0B }, 100L, true),
                // fid based equality (null fileId, same fid and tree id)
                Arguments.of(null, null, 200L, true));
    }

    @ParameterizedTest(name = "equals/hashCode consistent for treeId={2}")
    @MethodSource("equalsHashParams")

    }

    /**
     * Test null safety in comparisons
     */
    public void test_nullSafety() {
        CrawlerStatus status = CrawlerStatus.INITIALIZING;
        CrawlerStatus nullStatus = null;

        // Enum == null should be false
        assertFalse(status == nullStatus);
        assertFalse(status.equals(nullStatus));

        // null == Enum should be false

    void testDefaultConstructor() {
        // Given & When
        CIFSUnsupportedCryptoException exception = new CIFSUnsupportedCryptoException();

        // Then
        assertNull(exception.getMessage(), "Default constructor should have null message");
        assertNull(exception.getCause(), "Default constructor should have null cause");

  }

  /*
   * Our implementation works fine with a null `dir`. However, there's nothing in the documentation
   * of the supertype that suggests that implementations are expected to tolerate null. That said, I
   * see calls in Google code that pass a null `dir` to a FilenameFilter.... So let's declare the
   * parameter as non-nullable (since passing null to a FilenameFilter is unsafe in general), but if

   *
   * @param element the element to add one occurrence of; may be null only if explicitly allowed by
   *     the implementation
   * @return {@code true} always, since this call is required to modify the multiset, unlike other
   *     {@link Collection} types
   * @throws NullPointerException if {@code element} is null and this implementation does not permit
   *     null elements