UniAddress uniAddress = new UniAddress(mockNbtAddress);
            when(mockNbtAddress.firstCalledName()).thenReturn("NBT_NAME");
            assertEquals("NBT_NAME", uniAddress.firstCalledName());
            verify(mockNbtAddress, times(1)).firstCalledName();
        }

        @Test
        void shouldReturnSmbServerNameWhenInetAddressIsDotQuadIP() throws UnknownHostException {

        // Test firstCalledName with a regular hostname
        mockName = new Name(mockConfig, "MYSERVER", 0x20, null);
        NbtAddress nbtAddress = new NbtAddress(mockName, testAddressInt, false, NbtAddress.H_NODE);
        assertEquals("MYSERVER", nbtAddress.firstCalledName());
    }

    @Test
    void testFirstCalledName_IpAddress() {
        // Test firstCalledName with an IP address string

    }

    @Test
    @DisplayName("firstCalledName should return valid name for session establishment")
    void testFirstCalledNameContract() {
        // Given
        String expectedFirstName = "SERVER";
        when(mockAddress.firstCalledName()).thenReturn(expectedFirstName);

        // When
        String firstName = mockAddress.firstCalledName();

        // Then

        when(addr.getHostName()).thenReturn(hostname);
        UniAddress ua = new UniAddress(addr);
        // Act
        String called = ua.firstCalledName();
        // Assert
        assertEquals(expectedPrefix, called, "firstCalledName should return uppercase prefix or SMBSERVER_NAME");
    }

    @Test
    void nextCalledNameWithNbtAddressReturnsDelegateValue() {
        // Arrange

     * method is used exclusively by the <code>jcifs.smb</code> package.
     *
     * @return the guessed name
     */
    @Override
    public String firstCalledName() {
        if (this.addr instanceof NbtAddress) {
            return ((NbtAddress) this.addr).firstCalledName();
        }

        this.calledName = ((InetAddress) this.addr).getHostName();
        if (isDotQuadIP(this.calledName)) {

    /**
     * Guess called name to try for session establishment. These
     * methods are used by the smb package.
     *
     * @return guessed name
     */
    String firstCalledName();

    /**
     * Guess next called name to try for session establishment. These
     * methods are used by the smb package.
     *
     * @param tc the transport context to use for name resolution
     *

     * method is used exclusively by the <code>jcifs.smb1.smb1</code> package.
     *
     * @return the first called name to try
     */

    public String firstCalledName() {
        if (addr instanceof NbtAddress) {
            return ((NbtAddress) addr).firstCalledName();
        }
        calledName = ((InetAddress) addr).getHostName();
        if (isDotQuadIP(calledName)) {
            calledName = NbtAddress.SMBSERVER_NAME;

    /**
     * Guess next called name to try for session establishment. These
     * methods are used by the smb package.
     *
     * @return guessed name
     */
    @Override
    public String firstCalledName() {

        this.calledName = this.hostName.name;

        if (Character.isDigit(this.calledName.charAt(0))) {
            int i, len, dots;
            char[] data;

                && !NtlmPasswordAuthentication.NULL.equals(auth);
    }

    void ssn139() throws IOException {
        final Name calledName = new Name(address.firstCalledName(), 0x20, null);
        do {
            /* These Socket constructors attempt to connect before SO_TIMEOUT can be applied
            if (localAddr == null) {

     * methods are used by the smb package.
     */

    /**
     * Gets the first called name for session establishment.
     *
     * @return the first called name to try
     */
    public String firstCalledName() {

        calledName = hostName.name;

        if (Character.isDigit(calledName.charAt(0))) {
            int i, len, dots;
            char[] data;