assertEquals(expectedSessionId, nextReq.getSessionId(), "prepare() should propagate sessionId");
    }

    @Test
    @DisplayName("Decode with SUCCESS should parse body and non-guest flag")
    void testDecodeSuccessParsesBody() throws Exception {
        Smb2SessionSetupResponse resp = newResponse();

        byte[] buf = new byte[256];
        int headerStart = 0;