@Test
    @DisplayName("reauthenticate throws CIFSException when underlying call fails")
    void reauthenticate_throws() throws CIFSException {
        doThrow(new CIFSException("reauth failed")).when(session).reauthenticate();
        CIFSException ex = assertThrows(CIFSException.class, () -> session.reauthenticate());
        assertTrue(ex.getMessage().contains("failed"));

        @Test
        @DisplayName("Binary constructor happy path and round-trip via toByteArray")
        void testBinaryConstructorAndToByteArray() {
            // Arrange: revision=1, count=2, identAuth zeros except last byte, subauth 10, 20
            byte[] ident = new byte[] { 0, 0, 0, 0, 0, 5 };
            rpc.sid_t st = buildSidT((byte) 1, ident, 10, 20);

            byte[] bytes = SID.toByteArray(st);

                                }
                            }
                            log.debug("Session expired, trying reauth", e);
                            return reauthenticate(trans, this.targetDomain, request, response, params);
                        }
                    }
                    if (log.isTraceEnabled()) {

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