UrlQueueImpl<Long> queue = new UrlQueueImpl<>();

        String metaData = "{\"key\":\"value\"}";
        queue.setMetaData(metaData);
        assertEquals(metaData, queue.getMetaData());

        queue.setMetaData(null);
        assertNull(queue.getMetaData());
    }

    public void test_encodingGetterSetter() {
        // Test encoding getter/setter

     *
     * @return the metadata, or <code>null</code> if none loaded
     */
    Metadata getMetadata();

    /**
     * Set the metadata contents.
     *
     * @param metadata the metadata
     */
    void setMetadata(Metadata metadata);

    /**
     * Whether this represents a snapshot.
     *
     * @return if it is a snapshot
     */

     * Retrieves the metadata associated with the URL queue.
     *
     * @return a String representing the metadata.
     */
    String getMetaData();

    /**
     * Sets the metadata for the URL queue.
     *
     * @param metaData the metadata to set
     */
    void setMetaData(String metaData);

    /**
     * Retrieves the encoding of the URL queue.
     *
     * @return the encoding as a String.
     */

     */
    @Override
    public void setUrl(final String url) {
        this.url = url;
    }

    @Override
    public String getMetaData() {
        return metaData;
    }

    @Override
    public void setMetaData(final String metaData) {
        this.metaData = metaData;
    }

    @Override
    public String getEncoding() {
        return encoding;
    }

        versioning.setSnapshot(snapshot);
        return versioning;
    }

    @Override
    public void setMetadata(Metadata metadata) {
        this.metadata = metadata;
    }

    @Override
    public Metadata getMetadata() {
        return metadata;
    }

    @Override
    public void merge(org.apache.maven.repository.legacy.metadata.ArtifactMetadata metadata) {

        title.appendChild(document.createTextNode(" "));
        Element literal = document.createElement("literal");
        title.appendChild(literal);
        literal.appendChild(document.createTextNode(propertyDoc.getName()));

        if (!propertyDoc.getMetaData().isProviderApi()) {
            if (!propertyDoc.getMetaData().isWriteable()) {

            StringBuilder signature = new StringBuilder();
            signature.append("(");
            for (int i = 0; i < methodDoc.getMetaData().getParameters().size(); i++) {
                if (i > 0) {
                    signature.append(", ");
                }
                signature.append(methodDoc.getMetaData().getParameters().get(i).getName());
            }
            signature.append(")");

        println("metadataDeployed", event.getMetadata() + " to " + event.getRepository());
    }

    @Override
    public void metadataDeploying(RepositoryEvent event) {
        println("metadataDeploying", event.getMetadata() + " to " + event.getRepository());
    }

    @Override
    public void metadataInstalled(RepositoryEvent event) {
        println("metadataInstalled", event.getMetadata() + " to " + event.getFile());
    }

        section.setAttribute("role", "detail");

        Element title = document.createElement("title");
        section.appendChild(title);
        title.appendChild(linkRenderer.link(methodDoc.getMetaData().getReturnType(), listener));
        title.appendChild(document.createTextNode(" "));
        Element literal = document.createElement("literal");
        title.appendChild(literal);

        addPluginMapping(goalPrefix, artifactId, artifactId);
    }

    public void addPluginMapping(String goalPrefix, String artifactId, String name) {
        List<Plugin> plugins = getMetadata().getPlugins();
        boolean found = false;
        for (Iterator<Plugin> i = plugins.iterator(); i.hasNext() && !found; ) {
            Plugin plugin = i.next();
            if (plugin.getPrefix().equals(goalPrefix)) {