assertEquals("http://hoge.com/peke.html", urlConvertHelper.convert(url));
    }

    public void test_convert_null() {
        String url;

        url = null;
        assertNull(urlConvertHelper.convert(url));

        url = "";
        assertEquals("", urlConvertHelper.convert(url));

        url = " ";
        assertEquals(" ", urlConvertHelper.convert(url));

    }

     *
     * @param url
     *            The URL. Must not be {@literal null}.
     * @return A {@link URLConnection} object to the URL.
     */
    public static URLConnection openConnection(final URL url) {
        assertArgumentNotNull("url", url);

        try {
            final URLConnection connection = url.openConnection();
            connection.setUseCaches(false);

     *
     * @param url The file, must not be {@code null}.
     */
    public UrlSource(URL url) {
        this.url = Objects.requireNonNull(url, "url cannot be null");
        this.hashCode = Objects.hashCode(url);
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return url.openStream();
    }

    @Override
    public String getLocation() {
        return url.toString();

  }

  @Test
  fun fragmentNonAsciiThatOffendsJavaNetUri() {
    val url = "http://host/#\u0080".toHttpUrl()
    assertThat(url.toString()).isEqualTo("http://host/#\u0080")
    assertThat(url.fragment).isEqualTo("\u0080")
    assertThat(url.encodedFragment).isEqualTo("\u0080")
    // Control characters may be stripped!
    assertThat(url.toUri()).isEqualTo(URI("http://host/#"))
  }

  @Test

     *
     * @param url
     *            The URL representing the file.
     * @param baseName
     *            The base name.
     * @return The base directory above the root package.
     */
    protected static File getBaseDir(final URL url, final String baseName) {
        assertArgumentNotNull("url", url);

        File file = URLUtil.toFile(url);

    }

    /**
     * Creates a URL object from the current URL and a relative or absolute URL string.
     *
     * @param currentUrl the current URL as base
     * @param url the URL string to process
     * @return the URL object
     * @throws MalformedURLException if the URL is malformed
     */
    protected URL getURL(final String currentUrl, final String url) throws MalformedURLException {

    public void test_getClient_null() {
        String url;
        CrawlerClient client;

        url = null;
        client = clientFactory.getClient(url);
        assertNull(client);

        url = "";
        client = clientFactory.getClient(url);
        assertNull(client);

        url = " ";
        client = clientFactory.getClient(url);
        assertNull(client);
    }

    }

    /**
     * Returns the URL.
     * @return The URL.
     */
    public String getUrl() {
        return url;
    }

    /**
     * Sets the URL.
     * @param url The URL.
     */
    public void setUrl(final String url) {
        this.url = url;
    }

    /**
     * Converts this URL filter to XContent format for OpenSearch indexing.
     *

     * @param url The URL to request.
     * @return The ResponseData.
     */
    protected ResponseData doHead(final String url) {
        throw new CrawlerSystemException("HEAD method is not supported.");
    }

    /**
     * Performs a POST request.
     * @param url The URL to request.
     * @return The ResponseData.
     */
    protected ResponseData doPost(final String url) {

     * This method applies duplicate host conversion before storing the URL.
     *
     * @param childUrl the child URL to store
     * @param parentUrl the parent URL that referenced this child URL
     * @param weight the weight/priority of the child URL
     * @param depth the crawling depth of the child URL
     */
    @Override