*
     * @param offset file offset
     * @param length operation length
     * @param fileSize total file size
     * @throws SmbException if parameters are invalid
     */
    public void validateFileOperation(long offset, long length, long fileSize) throws SmbException {
        totalValidations.incrementAndGet();

        if (offset < 0) {
            failedValidations.incrementAndGet();

    public void testValidFileOperation() throws Exception {
        validator.validateFileOperation(0, 1024, 10000);
        validator.validateFileOperation(5000, 1000, 10000);
    }

    @Test
    public void testFileOperationNegativeOffset() throws Exception {
        assertThrows(SmbException.class, () -> {
            validator.validateFileOperation(-1, 100, 1000);
        });
    }

    @Test