if (domains == null) {
            return false;
        }
        domain = domain.toLowerCase();
        return domains.get(domain) != null;
    }

    /**
     * Gets a domain controller transport for the specified domain
     * @param domain the domain name
     * @param auth the authentication credentials
     * @return an SMB transport to the domain controller

   * </ul>
   *
   * @param domain A domain name (not IP address)
   * @throws IllegalArgumentException if {@code domain} is not syntactically valid according to
   *     {@link #isValid}
   * @since 10.0 (previously named {@code fromLenient})
   */
  @CanIgnoreReturnValue // TODO(b/219820829): consider removing
  public static InternetDomainName from(String domain) {
    return new InternetDomainName(checkNotNull(domain));

      return domain.minValue();
    }

    @Override
    Comparable<?> greatestValueBelow(DiscreteDomain<Comparable<?>> domain) {
      throw new AssertionError();
    }

    @Override
    Cut<Comparable<?>> canonical(DiscreteDomain<Comparable<?>> domain) {
      try {
        return Cut.belowValue(domain.minValue());
      } catch (NoSuchElementException e) {

    @Test
    @DisplayName("Test constructor with domain and server types")
    void testConstructor() {
        String domain = "WORKGROUP";
        int serverTypes = NetServerEnum2.SV_TYPE_ALL;

        netServerEnum2 = new NetServerEnum2(realConfig, domain, serverTypes);

        assertNotNull(netServerEnum2);
        assertEquals(domain, getFieldValue(netServerEnum2, "domain"));

    }

    @ParameterizedTest
    @MethodSource("domains")
    @DisplayName("getUserDomain handles null and empty")
    void getUserDomain_edges(String domain) {
        TestCredentials creds = new TestCredentials(domain, false, false, new Subject(), false);
        assertEquals(domain, creds.getUserDomain());
    }

    static Stream<String> domains() {
        return Stream.of(null, "", "SALES");
    }

    final Range<C> range;
    final DiscreteDomain<C> domain;

    private SerializedForm(Range<C> range, DiscreteDomain<C> domain) {
      this.range = range;
      this.domain = domain;
    }

    private Object readResolve() {
      return new RegularContiguousSet<>(range, domain);
    }
  }

  @GwtIncompatible
  @J2ktIncompatible
    @Override

        synchronized (this.domainsLock) {
            final Map<String, Map<String, CacheEntry<DfsReferralDataInternal>>> domains = getTrustedDomains(tf);
            if (domains == null) {
                return false;
            }
            domain = domain.toLowerCase(Locale.ROOT);
            return domains.get(domain) != null;
        }
    }

        }
    }

    // Test constructor with domain, username, and password
    @Test
    void testConstructorWithDomainUsernamePassword() {
        NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication("DOMAIN", "user", "password");
        assertEquals("DOMAIN", auth.getDomain());
        assertEquals("user", auth.getUsername());

            // Default constructor
        }

        /** Domain NetBIOS name. */
        public rpc.unicode_string name;
        /** DNS domain name. */
        public rpc.unicode_string dns_domain;
        /** DNS forest name. */
        public rpc.unicode_string dns_forest;
        /** Domain GUID. */
        public rpc.uuid_t domain_guid;
        /** Domain security identifier. */
        public rpc.sid_t sid;

                if (ci > 0) {
                    domain = username.substring(0, ci);
                    username = username.substring(ci + 1);
                }
            }
        }

        this.domain = domain;
        this.username = username;
        this.password = password;

        initDefaults();

        if (domain == null) {
            this.domain = DEFAULT_DOMAIN;
        }