* @return instance for type, null if the type cannot be unwrapped
     */
    <T extends Address> T unwrap(Class<T> type);

    /**
     * Gets the host name of this address.
     *
     * @return the resolved host name, or the host address if it could not be resolved
     */
    String getHostName();

    /**
     * Return the IP address as text such as "192.168.1.15".
     *

            // Validate host
            String host = url.getHost();
            if (host == null || host.isEmpty()) {
                throw new SmbException("SMB URL missing host");
            }

            // Validate host format
            if (!isValidHost(host)) {
                throw new SmbException("Invalid host in SMB URL");
            }

    }

    // Happy path: session retrieval with host/domain variations
    @ParameterizedTest
    @DisplayName("getSmbSession(ctx,host,domain) returns session for various inputs")
    @CsvSource({ "server,DOMAIN", "server,", ",DOMAIN", "," })
    void getSmbSession_withTarget(String host, String domain) {

        assertEquals("smb", url.getProtocol());
    }

    @Test
    @DisplayName("parseURL: relative spec without scheme is prefixed for empty host")
    void testParseURL_RelativeSpecWithEmptyHost() throws MalformedURLException {
        // Arrange: base URL with empty host
        Handler handler = newHandler();
        URL base = new URL(null, "smb://", handler);

    /**
     *
     * @param loc
     * @param host
     * @return tree handle
     * @throws IOException
     */
    public synchronized SmbTreeHandleImpl connectHost(final SmbResourceLocatorImpl loc, final String host) throws IOException {
        return connectHost(loc, host, null);
    }

    /**
     *
     * @param loc
     * @param host
     * @param referral
     * @return tree handle

    }

    @Test
    @DisplayName("Constructor should throw SmbException for non-workgroup type with host")
    void testConstructor_NonWorkgroupType_ThrowsException() throws Exception {
        // Given: A non-workgroup type with a host
        when(locator.getType()).thenReturn(SmbConstants.TYPE_SERVER);
        when(locator.getURL()).thenReturn(createSmbURL("smb://server/"));

        SmbResourceLocatorImpl l1 = locator("smb://host/share?server=srv-from-query");
        assertSame(a1, l1.getAddress());

        // Query parameter 'address' builds UniAddress from IP
        SmbResourceLocatorImpl l2 = locator("smb://host/share?address=127.0.0.1");
        Address first = l2.getAddress();
        assertTrue(first instanceof UniAddress);

        // Host with root path -> possibleNTDomainOrWorkgroup=true

    }

    /**
     * Constructs a NetBIOS session request packet.
     *
     * @param calledName the NetBIOS name of the called (destination) host
     * @param callingName the NetBIOS name of the calling (source) host
     */
    public SessionRequestPacket(final Name calledName, final Name callingName) {
        type = SESSION_REQUEST;
        this.calledName = calledName;
        this.callingName = callingName;
    }

    protected void parseURL(final URL u, String spec, final int start, int limit) {
        final String host = u.getHost();
        String path, ref;
        int port;

        if (spec.equals("smb1://")) {
            spec = "smb1:////";
            limit += 2;
        } else if (!spec.startsWith("smb1://") && host != null && host.length() == 0) {
            spec = "//" + spec;
            limit += 2;
        }

        // Act
        String result = smbTransport.getRemoteHostName();

        // Assert
        assertNotNull(result, "Remote host name should not be null");
        assertEquals(hostName, result, "Returned remote host name should be the mocked host name");
        verify(smbTransport).getRemoteHostName(); // Verify that the method was called
    }