}

    @Test
    @DisplayName("openConnection creates SmbFile for valid URL")
    void testOpenConnectionWithValidUrl() throws IOException {
        // Arrange - Create URL with handler
        URL url = new URL(null, "smb://host/share", handler);

        // Act
        URLConnection conn = handler.openConnection(url);

        // Assert
        assertNotNull(conn);

            rule.server
              .url("/")
              .toUrl()
              .openConnection()
              .connect()
          }
        },
        Description.EMPTY,
      )
    statement.evaluate()
    assertThat(called.get()).isTrue()
    try {
      rule.server
        .url("/")
        .toUrl()
        .openConnection()
        .connect()
      fail()
    } catch (expected: ConnectException) {
    }

    }

    @Test
    @DisplayName("openConnection with null URL throws NullPointerException")
    void testOpenConnection_NullInput() {
        // Arrange
        Handler handler = newHandlerWith(mockCtx);

        // Act & Assert
        assertThrows(NullPointerException.class, () -> handler.openConnection(null), "Null URL should throw NPE");

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }

import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    public static final String PROTOCOL_TYPE = "file";

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }

                setURL(u, "zip", null, 0, null, null, spec.substring(4), null, null);
            }

            @Override
            protected URLConnection openConnection(final URL u) throws IOException {
                return null;
            }
        });
        final String root = new File("/").getCanonicalPath();

import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    public static final String PROTOCOL_TYPE = "test";

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }

        return DEFAULT_HTTP_PORT;
    }

    @Override
    protected URLConnection openConnection(URL url) throws IOException {
        url = new URL(url, url.toExternalForm(), getDefaultStreamHandler(url.getProtocol()));
        return new NtlmHttpURLConnection((HttpURLConnection) url.openConnection());
    }

    private static URLStreamHandler getDefaultStreamHandler(final String protocol) throws IOException {

import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    public static final String PROTOCOL_TYPE = "web";

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }

     */
    public Handler() {
    }

    @Override
    protected int getDefaultPort() {
        return SmbConstants.DEFAULT_PORT;
    }

    @Override
    public URLConnection openConnection(final URL u) throws IOException {
        return new SmbFile(u);
    }

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