setField(session, "sessionKey", key);
        assertArrayEquals(key, session.getSessionKey());
    }

    @Test
    @DisplayName("getSmbTree returns same instance for same share/service")
    void testGetSmbTreeReuses() {
        SmbSessionImpl session = newSession();
        SmbTreeImpl t1 = session.getSmbTree("IPC$", null);
        SmbTreeImpl t2 = session.getSmbTree("ipc$", null); // case-insensitive match