}

    @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

    /**
     * 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.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)) {