}

    @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);

            @Override
            protected URLConnection openConnection(URL u) throws IOException {
                return mock(HttpURLConnection.class);
            }
        };

        // Create mock HTTPS handler
        URLStreamHandler httpsHandler = new URLStreamHandler() {
            @Override
            protected URLConnection openConnection(URL u) throws IOException {

    }

    @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");

        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 {

        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(), this.transportContext);
    }

     */
    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();

        this.transportContext = tc;
    }

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

    @Override
    public URLConnection openConnection(final URL u) throws IOException {
        if (log.isDebugEnabled()) {
            log.debug("Opening file " + u);
        }
        return new SmbFile(u, getTransportContext());
    }

    /**
     * @return

        } else if (stream != null) {
            when(conn.getInputStream()).thenReturn(stream);
        }
    }

    /**
     * Test helper class for mocking URL.openConnection() behavior
     */
    static class TestURLStreamHandler extends java.net.URLStreamHandler {
        private final List<HttpURLConnection> connections = new ArrayList<>();
        private int currentIndex = 0;

        }
        return message;
    }

    private void reconnect() throws IOException {
        connection = (HttpURLConnection) connection.getURL().openConnection();
        connection.setRequestMethod(method);
        headerFields = null;
        final Iterator properties = requestProperties.entrySet().iterator();
        while (properties.hasNext()) {

    // Minimal URLStreamHandler to allow creating smb:// URLs in tests
    private static final URLStreamHandler SMB_HANDLER = new URLStreamHandler() {
        @Override
        protected URLConnection openConnection(URL u) {
            return null; // not used
        }
    };

    @BeforeEach
    void setup() {
        when(ctx.getConfig()).thenReturn(config);
        when(ctx.getCredentials()).thenReturn(creds);