}

    /**
     * Test getInitialSize() when the size is zero.
     */
    @Test
    void testGetInitialSize_zero() {
        long expectedSize = 0L;
        when(smbFileHandle.getInitialSize()).thenReturn(expectedSize);
        long actualSize = smbFileHandle.getInitialSize();
        assertEquals(expectedSize, actualSize, "getInitialSize should return 0 for an empty file.");

     */
    void release() throws CIFSException;

    /**
     * Returns the initial size of the file when it was opened
     *
     * @return the file size when it was opened
     */
    long getInitialSize();

        when(mockFileHandle.acquire()).thenReturn(mockFileHandle);

        when(mockFile.openUnshared(anyInt(), anyInt(), anyInt(), anyInt(), anyInt())).thenReturn(mockFileHandle);
        lenient().when(mockFileHandle.getInitialSize()).thenReturn(100L); // File already has 100 bytes

        when(mockTreeHandle.send(any(Smb2WriteRequest.class), any())).thenReturn(mockWriteResponse);
        when(mockWriteResponse.getCount()).thenReturn(8);

    }

    @Test
    @DisplayName("getInitialSize returns constructor value")
    void getInitialSize_returnsValue() {
        when(cfg.isTraceResourceUsage()).thenReturn(false);
        stubValidTree(1L, true, true);
        SmbFileHandleImpl h = new SmbFileHandleImpl(cfg, 1, tree, "//size", 0, 0, 0, 0, 987654321L);
        assertEquals(987654321L, h.getInitialSize());
    }

            try (SmbFileHandleImpl sfd =
                    src.openUnshared(0, SmbConstants.O_RDONLY, SmbConstants.FILE_SHARE_READ, SmbConstants.ATTR_NORMAL, 0)) {
                if (sfd.getInitialSize() == 0) {
                    try (SmbFileHandleImpl edfd = openCopyTargetFile(dest, src.getAttributes(), !write)) {
                        return;
                    }
                }

        when(sh.isSameTree(dh)).thenReturn(true);

        // Source open returns a handle that reports size 0
        SmbFileHandleImpl sfd = mock(SmbFileHandleImpl.class);
        when(sfd.getInitialSize()).thenReturn(0L);
        when(src.openUnshared(eq(0), eq(SmbConstants.O_RDONLY), eq(SmbConstants.FILE_SHARE_READ), eq(SmbConstants.ATTR_NORMAL), eq(0)))
                .thenReturn(sfd);

        try (SmbTreeHandleImpl th = file.ensureTreeConnected()) {
            this.smb2 = th.isSMB2();
            try (SmbFileHandleImpl fh = ensureOpen()) {
                if (append) {
                    this.fp = fh.getInitialSize();
                }
                init(th);
                if (!append && this.smb2) {
                    // no open option for truncating, need to truncate the file

            throw new SmbException("Descriptor is no longer valid");
        }
        return this.fileId;
    }

    /**
     * @return the initialSize
     */
    @Override
    public long getInitialSize() {
        return this.initialSize;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.SmbFileHandle#getTree()
     */
    @Override
    public SmbTreeHandleImpl getTree() {