assertEquals(21, sid.sub_authority[0]);
        assertEquals(1, sid.sub_authority[1]);
    }

    /**
     * Test constructor with an invalid SID string.
     */
    @Test
    void testStringConstructorInvalidFormat() {
        assertThrows(SmbException.class, () -> new SID("invalid-sid"));
        assertThrows(SmbException.class, () -> new SID("S-1"));
    }

    /**
     * Test constructor with a byte array.