data[0] = 9;
        assertEquals(9, t.getMechanismToken()[0], "no defensive copy; reflects external mutation");
    }

    @Test
    @DisplayName("Setter and getter for mechanismListMIC work")
    void setGetMechanismListMIC() {
        TestSpnegoToken t = new TestSpnegoToken();
        byte[] mic = new byte[] { 7, 8, 9, 10 };
        t.setMechanismListMIC(mic);