def variant = root.rootComponent.getConfiguration('conf')

        when:
        builder.validator.validateMutation(mutationType)
        def otherRoot = builder.toRootComponent('root')

        then:
        root.rootComponent.is(otherRoot.rootComponent)
        root.rootComponent.metadata.is(otherRoot.rootComponent.metadata)
        !otherRoot.rootComponent.getConfiguration('conf').is(variant)

        when:

        this.signatureVerificationService = signatureVerificationServiceFactory.create(localKeyring, keyServers(), verifier.getConfiguration().isUseKeyServers());
    }

    private List<URI> keyServers() {
        return DefaultKeyServers.getOrDefaults(verifier.getConfiguration().getKeyServers());
    }

    @Override

            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 = []) {

        conf3.getDependencies().add(dependency3)

        then:
        state.getConfiguration("child1").metadata.dependencies*.source == [dependency1, dependency2, dependency3]
        state.getConfiguration("child2").metadata.dependencies*.source == [dependency1]
        state.getConfiguration("other").metadata.dependencies.isEmpty()
    }

    def "builds and caches exclude rules for a configuration"() {