assertTrue(ex.getMessage().contains("disposed"));
        }

        @Test
        @DisplayName("Supported/preferred mech edge cases (null, empty, unknown)")
        void testMechanismEdges() {
            DummySSPContext empty = new DummySSPContext(new byte[] { 1 }, false, "", new ASN1ObjectIdentifier[0], 0, false);
            assertFalse(empty.isSupported(new ASN1ObjectIdentifier("1.2.3")));