* @throws SmbException
     */
    synchronized SmbFileHandleImpl ensureOpen() throws CIFSException {
        if (this.handle == null || !this.handle.isValid()) {
            // one extra acquire to keep this open till the stream is released
            if (this.file instanceof SmbNamedPipe) {
                this.handle = this.file.openUnshared(SmbConstants.O_EXCL, ((SmbNamedPipe) this.file).getPipeType() & 0xFF0000, this.sharing,

        @NullAndEmptySource
        @DisplayName("Should handle null and empty links")
        void testNullAndEmptyLinks(String link) {
            referralData.setLink(link);
            assertEquals(link, referralData.getLink());
        }

        @ParameterizedTest
        @NullAndEmptySource
        @DisplayName("Should handle null and empty keys")
        void testNullAndEmptyKeys(String key) {

            // Should use caller available units, not actual free units
            assertEquals(500L * 8 * 512, fileFsFullSizeInfo.getFree());
        }

        @Test
        @DisplayName("Should handle negative values in buffer")
        void shouldHandleNegativeValuesInBuffer() throws SMBProtocolDecodingException {
            // Given - negative values (treated as unsigned in protocol)

If an incoming request does not validate correctly then a `400` response will be sent.

## `GZipMiddleware` { #gzipmiddleware }

Handles GZip responses for any request that includes `"gzip"` in the `Accept-Encoding` header.

The middleware will handle both standard and streaming responses.

{* ../../docs_src/advanced_middleware/tutorial003_py39.py hl[2,6] *}

The following arguments are supported:

            assertEquals(2048, response.getEndOfFile());
            assertEquals(0x10, response.getFileAttributes());
        }

        @Test
        @DisplayName("Should handle all zero values correctly")
        void testReadBytesWireFormatWithZeroValues() throws SMBProtocolDecodingException {
            // Given
            byte[] buffer = new byte[60];

        @Test
        @DisplayName("Should handle null buffer in decode")
        void testNullBuffer() {
            FileFsSizeInformation info = new FileFsSizeInformation();

            assertThrows(NullPointerException.class, () -> {
                info.decode(null, 0, 0);
            });
        }

        @Test
        @DisplayName("Should handle insufficient buffer length")

import org.junit.jupiter.api.Test;

/**
 * Test suite for jcifs.https.Handler class.
 * Tests HTTPS URL stream handler functionality with NTLM authentication support.
 */
@DisplayName("HTTPS Handler Tests")
class HandlerTest {

    private Handler handler;

    @BeforeEach
    void setUp() {
        handler = new Handler(null);
    }

    @Nested
    @DisplayName("Constructor Tests")

        assertEquals("Expected structureSize = 9", exception.getMessage());
    }

    @Test
    @DisplayName("Should handle empty notification list")
    void testEmptyNotificationList() throws Exception {
        // Given
        byte[] buffer = new byte[256];
        int offset = 0;

        setHeaderStart(response, 64);

        @Test
        @DisplayName("Should handle empty or null ApplyToText")
        void shouldHandleEmptyApplyToText() {
            ACE ace1 = mock(ACE.class);
            ACE ace2 = mock(ACE.class);
            when(ace1.getApplyToText()).thenReturn("");
            when(ace2.getApplyToText()).thenReturn(null);

            assertEquals("", ace1.getApplyToText(), "Should handle empty apply text");

        CIFSException expectedException = new CIFSException("Failed to close handle");
        doThrow(expectedException).when(watchHandle).close();

        // Execute and verify
        CIFSException thrown = assertThrows(CIFSException.class, () -> {
            watchHandle.close();
        });

        assertEquals("Failed to close handle", thrown.getMessage());
        verify(watchHandle, times(1)).close();
    }