@Test
    @DisplayName("toString contains class name and message when provided")
    void toString_containsClassName_and_Message() {
        // Arrange
        String msg = "signature invalid";
        SMBSignatureValidationException ex = new SMBSignatureValidationException(msg);

        // Act
        String s = ex.toString();

        // Assert

        assertEquals(WitnessEventType.CLIENT_MOVE, WitnessEventType.valueOf("CLIENT_MOVE"));
    }

    @Test
    void testInvalidEnumValueOf() {
        // Test that invalid valueOf throws exception
        assertThrows(IllegalArgumentException.class, () -> {
            WitnessServiceType.valueOf("INVALID_TYPE");
        });

        assertThrows(IllegalArgumentException.class, () -> {

- ListObjectsV2 API calls must be used to list zip file content.
- Range requests for GetObject/HeadObject for individual files from zip is not supported.
- Names inside ZIP files are kept unmodified, but some may lead to invalid paths. See [Object key naming guidelines](https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-keys.html) on safe names.
- This API behavior is limited for following **read** operations on files inside a zip archive:

     * This method delegates to {@link FileInputStream#mark(int)}.
     *
     * @param readlimit the maximum limit of bytes that can be read before the mark position becomes invalid
     */
    @Override
    public synchronized void mark(final int readlimit) {
        fileInputStream.mark(readlimit);
    }

    /**
     * Tests if this input stream supports the mark and reset methods.

        assertSame(transport, asIface);
        SmbTransportInternal asInternal = transport.unwrap(SmbTransportInternal.class);
        assertSame(transport, asInternal);

        // Invalid type should throw
        class OtherTransport implements SmbTransport {
            @Override
            public String getRemoteHostName() {
                return "test";
            }

            @Override

}

// ShardSize - returns actual shared size from erasure blockSize.
func (e ErasureInfo) ShardSize() int64 {
	return ceilFrac(e.BlockSize, int64(e.DataBlocks))
}

// IsValid - tells if erasure info fields are valid.
func (fi FileInfo) IsValid() bool {
	if fi.Deleted {
		// Delete marker has no data, no need to check
		// for erasure coding information
		return true
	}
	dataBlocks := fi.Erasure.DataBlocks

    stream.defaultReadObject();
    int elementCount = stream.readInt();
    if (elementCount < 0) {
      throw new InvalidObjectException("Invalid size: " + elementCount);
    }
    init(elementCount);
    for (int i = 0; i < elementCount; i++) {
      K key = (K) stream.readObject();
      V value = (V) stream.readObject();
      put(key, value);

        assertThrows(PACDecodingException.class, () -> new KerberosToken(wrongOidToken));
    }

    /**
     * Test constructor with a malformed Kerberos token (invalid inner structure).
     *
     * @throws IOException if an I/O error occurs
     */
    @Test
    void testConstructorWithMalformedKerberosToken() throws IOException {

                ASN1Integer tktvno = ASN1Util.as(ASN1Integer.class, tagged);
                if (!tktvno.getValue().equals(new BigInteger(KerberosConstants.KERBEROS_VERSION))) {
                    throw new PACDecodingException("Invalid kerberos version " + tktvno);
                }
                break;
            case 1:// Realm
                DERGeneralString derRealm = ASN1Util.as(DERGeneralString.class, tagged);

        SmbException exception = assertThrows(SmbException.class, () -> new NetServerEnumIterator(parent, treeHandle, "*", 0, null));

        assertTrue(exception.getMessage().contains("invalid"));
        verify(treeHandle, never()).acquire();
    }

    @Test
    @DisplayName("Constructor should handle null parent")
    void testConstructor_NullParent_ThrowsNPE() {