validator.validateFileSize(0);
        validator.validateFileSize(1024);
        validator.validateFileSize(1073741824L); // 1GB
    }

    @Test
    public void testNegativeFileSize() throws Exception {
        assertThrows(SmbException.class, () -> {
            validator.validateFileSize(-1);
        });
    }

    @Test
    public void testFileSizeTooLarge() throws Exception {