@Test
    @DisplayName("Test getInfo with class when info is null throws NullPointerException")
    void testGetInfoWithClassWhenInfoIsNull() {
        response = new Smb2QueryInfoResponse(mockConfig, (byte) 1, (byte) 2);

        assertThrows(NullPointerException.class, () -> response.getInfo(FileInternalInfo.class),
                "Should throw NullPointerException when info is null");
    }

    @Test

    @DisplayName("Should throw exception for null encryption key")
    void testNullEncryptionKey() {
        // When/Then
        assertThrows(NullPointerException.class, () -> {
            new Smb2EncryptionContext(1, DialectVersion.SMB311, null, testDecryptionKey);
        }, "Should throw NullPointerException for null encryption key");
    }

    @Test
    @DisplayName("Should throw exception for null decryption key")

        Smb2CloseRequest requestWithNull = new Smb2CloseRequest(mockConfig, null, testFileName);
        byte[] buffer = new byte[256];

        // Should throw NullPointerException when trying to copy null array
        assertThrows(NullPointerException.class, () -> {
            requestWithNull.writeBytesWireFormat(buffer, 0);
        });
    }

    @Test
    @DisplayName("readBytesWireFormat should return 0")

        ace.allow = true;
        ace.access = 0x001200A9;
        ace.flags = 0x00;
        ace.sid = null;

        // This should throw NullPointerException as the current implementation doesn't handle null SID
        assertThrows(NullPointerException.class, () -> ace.toString());
    }

    @Test
    @DisplayName("Test decode creates new SID instance")
    void testDecodeCreatesNewSID() {

        // Arrange
        SmbBasicFileInfo info = null;

        // Act & Assert: attempting to call any method on null should throw NPE
        Assertions.assertThrows(NullPointerException.class, () -> {
            // Intentionally dereference null to validate exception behavior
            // This checks that callers must handle null references defensively
            info.getSize();
        });

        @DisplayName("Should handle null file ID during write")
        void testWriteWithNullFileId() {
            request.setFileId(null);
            byte[] buffer = new byte[256];

            assertThrows(NullPointerException.class, () -> request.writeBytesWireFormat(buffer, 0));
        }

        @Test
        @DisplayName("Should handle file ID of different sizes")
        void testWriteWithDifferentFileIdSizes() {

    void testMethodsWithNullBuffers() {
        netShareEnum = new NetShareEnum(realConfig);

        // Write methods return 0 when buffer is null (no NullPointerException thrown)
        assertEquals(0, netShareEnum.writeSetupWireFormat(null, 0));

        assertThrows(NullPointerException.class, () -> {
            netShareEnum.writeParametersWireFormat(null, 0);
        });

        // 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");

    @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(""));