assertEquals("S-1-5-21-200-300", combined.toString());
        }

        @Test
        @DisplayName("Constructor from sid_t with decrementAuthority drops last subauthority")
        void testConstructorFromSidTWithDecrement() {
            // Arrange
            byte[] ident = new byte[] { 0, 0, 0, 0, 0, 5 };
            rpc.sid_t st = buildSidT((byte) 1, ident, 10, 20, 30);

            // Act: type USER, decrement true