auth.setService("");
        assertEquals("", auth.getService());

        // Lifetime accessors (edge: zero/negative)
        auth.setUserLifeTime(0);
        assertEquals(0, auth.getUserLifeTime());
        auth.setUserLifeTime(-1);
        assertEquals(-1, auth.getUserLifeTime());

        auth.setLifeTime(0);
        assertEquals(0, auth.getLifeTime());
        auth.setLifeTime(-2);

        to.setUser(from.getUser());
        to.setRealm(from.getRealm());
        to.setService(from.getService());
        to.setLifeTime(from.getLifeTime());
        to.setUserLifeTime(from.getUserLifeTime());

        to.canFallback = from.canFallback;
        to.forceFallback = from.forceFallback;
    }

    /**