TestSpnegoToken t = new TestSpnegoToken();
        assertArrayEquals(new byte[0], t.toByteArray(), "empty array expected when mechanismToken is null");
    }

    @Test
    @DisplayName("toByteArray returns mechanismToken reference when present")
    void toByteArrayReturnsToken() throws IOException {
        TestSpnegoToken t = new TestSpnegoToken();
        byte[] raw = new byte[] { 11, 12, 13 };