@Test
    public void testIsValid() {
        SmbNegotiationRequest request = mock(SmbNegotiationRequest.class);
        when(request.isSigningEnforced()).thenReturn(true);
        response.getServerData().signaturesEnabled = true;

        assertTrue(response.isValid(mockContext, request));
        assertTrue(response.isSigningNegotiated());

        int maxBufferSize;
        int sessionKey;
        int capabilities;
        String oemDomainName;
        int securityMode;
        int security;
        boolean encryptedPasswords;
        boolean signaturesEnabled;
        boolean signaturesRequired;
        int maxNumberVcs;
        int maxRawSize;
        long serverTime;
        int serverTimeZone;
        int encryptionKeyLength;
        byte[] encryptionKey;

        // When - set all to true
        serverData.encryptedPasswords = true;
        serverData.signaturesEnabled = true;
        serverData.signaturesRequired = true;

        // Then
        assertTrue(serverData.encryptedPasswords);
        assertTrue(serverData.signaturesEnabled);
        assertTrue(serverData.signaturesRequired);

        // When - set all to false

            return false;
        }

        if (req.isSigningEnforced() || this.server.signaturesRequired
                || this.server.signaturesEnabled && ctx.getConfig().isSigningEnabled()) {
            this.negotiatedFlags2 |= SmbConstants.FLAGS2_SECURITY_SIGNATURES;
            if (req.isSigningEnforced() || isSigningRequired()) {