Xpp3Dom config0 = (Xpp3Dom) jdks.getToolchains().get(0).getConfiguration();
            assertEquals("lib/tools.jar", config0.getChild("toolsJar").getValue());
            assertEquals(2, config0.getChildCount());
            Xpp3Dom config1 = (Xpp3Dom) jdks.getToolchains().get(1).getConfiguration();
            assertEquals(2, config1.getChildCount());

            XmlNode pluginConfiguration = plugin.getConfiguration();
            if (pluginConfiguration != null) {
                return plugin.withExecutions(map(
                        plugin.getExecutions(),
                        execution -> execution.withConfiguration(
                                XmlNode.merge(execution.getConfiguration(), pluginConfiguration))));
            } else {
                return plugin;

                XmlNode parentDom = reportPlugin.getDelegate().getConfiguration();

                if (parentDom != null) {
                    for (ReportSet execution : reportPlugin.getReportSets()) {
                        XmlNode childDom = execution.getDelegate().getConfiguration();
                        childDom = XmlNode.merge(childDom, parentDom);

                    if (pluginExecutionId.equals(execution.getId())) {
                        setConfiguration(execution.getConfiguration());
                        break;
                    }
                }
            } else {
                setConfiguration(plugin.getConfiguration());
            }
        }
        return this;
    }

    } // -- void addGoal( String )

    /**
     * Get configuration to pass to the goals.
     *
     * @return Object
     */
    public Object getConfiguration() {
        return this.configuration;
    } // -- Object getConfiguration()

    /**
     * Method getGoals.
     *
     * @return List
     */
    public java.util.List<String> getGoals() {
        if (this.goals == null) {

                break;
            }
        }

        assertNotNull(plugin);

        assertEquals("1.0", plugin.getVersion());

        XmlNode configuration = plugin.getDelegate().getConfiguration();

        assertEquals(
                "src/conf/plexus.conf",
                configuration.getChild("plexusConfiguration").getValue());

        assertEquals(
                "src/conf/plexus.properties",

     *
     * @return Null if the configuration with the given name does not exist.
     */
    @Nullable
    LocalConfigurationGraphResolveMetadata getConfiguration(String name);

    /**
     * Get all names such that {@link #getConfiguration(String)} return a non-null value.
     */
    Set<String> getConfigurationNames();

        configuration("runtime")

        expect:
        metadata.toString() == 'group:module:version'
        metadata.getConfiguration('runtime').toString() == 'group:module:version configuration runtime'
    }

    def "returns null for unknown configuration"() {
        expect:
        metadata.getConfiguration("conf") == null
    }

    def configuration(String name, List<String> extendsFrom = []) {

    } // -- void addExecution( Execution )

    /**
     * Get configuration to pass to all goals run in this phase.
     *
     * @return Object
     */
    public Object getConfiguration() {
        return this.configuration;
    } // -- Object getConfiguration()

    /**
     * Method getExecutions.
     *
     * @return List
     */
    public java.util.List<Execution> getExecutions() {

        immutable.excludes.empty
        immutable.configurationNames == ["runtime", "default"] as Set
        def runtime = immutable.getConfiguration("runtime")
        runtime.artifacts.name.name == ["runtime.jar"]
        runtime.excludes.empty
        def defaultConfig = immutable.getConfiguration("default")
        defaultConfig.hierarchy as List == ["default", "runtime"]
        defaultConfig.transitive
        defaultConfig.visible