void testGetUserDomain() {
        // Given
        String domain = "TESTDOMAIN";
        when(mockCredentials.getUserDomain()).thenReturn(domain);

        // When
        String result = mockCredentials.getUserDomain();

        // Then
        assertEquals(domain, result);
        verify(mockCredentials).getUserDomain();
    }

    @Test
    @DisplayName("Should check for anonymous credentials")
    void testIsAnonymous() {

                        if (this.isUseUnicode()) {
                            this.accountName = this.accountName.toUpperCase();
                        }
                        this.primaryDomain = a.getUserDomain() != null ? a.getUserDomain().toUpperCase() : "?";
                    } else {
                        this.accountName = "";
                        this.primaryDomain = "";
                    }
                } else {

        when(mockCredentials.getUserDomain()).thenReturn(null);
        assertFalse(dfsImpl.isTrustedDomain(mockContext, "anydomain.com"));
    }

    @Test
    void testIsTrustedDomain_ConnectionFails() throws SmbAuthException {
        // Scenario: Transport connection fails
        when(mockCredentials.getUserDomain()).thenReturn("authdomain.com");

    void testIsTrustedDomain_NoUserDomain() throws CIFSException {
        when(mockConfig.isDfsDisabled()).thenReturn(false);
        when(mockContext.getCredentials()).thenReturn(mockCredentials);
        when(mockCredentials.getUserDomain()).thenReturn(null);
        assertFalse(dfsResolver.isTrustedDomain(mockContext, "anyDomain"));
    }

    @Test
    void testIsTrustedDomain_EmptyUserDomain() throws CIFSException {

     */
    <T extends Credentials> T unwrap(Class<T> type);

    /**
     * Get the domain of the user account.
     * @return the domain the user account is in
     */
    String getUserDomain();

    /**
     * Check if these are anonymous credentials.
     * @return whether these are anonymous credentials
     */
    boolean isAnonymous();

    /**
     * Check if these are guest credentials.

        when(auth.isAnonymous()).thenReturn(true);
        when(auth.isGuest()).thenReturn(true);
        when(auth.getUsername()).thenReturn("guest");
        when(auth.getUserDomain()).thenReturn("dom");

        // Construct
        SmbComSessionSetupAndX obj = new SmbComSessionSetupAndX(mockContext, mockNegotiate, mockAndX, auth);
        String accountName = (String) getField(obj, "accountName");

        }

        @Override
        public boolean isAnonymous() {
            return false; // not anonymous for test purposes
        }

        @Override
        public String getUserDomain() {
            return "TESTDOMAIN"; // test domain for test purposes
        }

        @Override
        public <T extends Credentials> T unwrap(Class<T> type) {
            if (type.isInstance(this)) {

                return;
            }
            final HttpSession ssn = request.getSession();
            ssn.setAttribute("NtlmHttpAuth", ntlm);
            ssn.setAttribute("ntlmdomain", ntlm.getUserDomain());
            ssn.setAttribute("ntlmuser", ntlm.getUsername());
        } else {
            final HttpSession ssn = request.getSession(false);
            if (ssn == null || ssn.getAttribute("NtlmHttpAuth") == null) {