assertTrue(response.isSigningNegotiated());
        assertTrue((response.getNegotiatedFlags2() & SmbConstants.FLAGS2_SECURITY_SIGNATURES) != 0);
    }

    @Test
    public void testIsValidWithUnicode() {
        SmbNegotiationRequest request = mock(SmbNegotiationRequest.class);
        response.getServerData().scapabilities = SmbConstants.CAP_UNICODE;
        // Set some required server data for valid response