byte[] storedFileId = (byte[]) fileIdField.get(request);
        assertArrayEquals(newFileId, storedFileId);
    }

    @Test
    @DisplayName("setFileId with null should set null file ID")
    void testSetFileIdWithNull() throws Exception {
        request.setFileId(null);

        Field fileIdField = Smb2FlushRequest.class.getDeclaredField("fileId");
        fileIdField.setAccessible(true);

        byte[] storedFileId = (byte[]) fileIdField.get(request);
        assertArrayEquals(newFileId, storedFileId);
    }

    @Test
    @DisplayName("setFileId with null should set null file ID")
    void testSetFileIdWithNull() throws Exception {
        request.setFileId(null);

        Field fileIdField = Smb2CloseRequest.class.getDeclaredField("fileId");
        fileIdField.setAccessible(true);