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

        for (Plugin plugin : plugins) {
            XmlNode pluginConfiguration = plugin.getDelegate().getConfiguration();

            if (pluginConfiguration != null) {
                for (PluginExecution execution : plugin.getExecutions()) {
                    XmlNode executionConfiguration = execution.getDelegate().getConfiguration();
                    executionConfiguration = XmlNode.merge(executionConfiguration, pluginConfiguration);

     *
     * @return The configuration to unmarshal into the bean or {@code null} if none.
     */
    Object getConfiguration();

    /**
     * Sets the configuration to unmarshal into the bean. The configuration should be taken from
     * {@link org.apache.maven.model.ConfigurationContainer#getConfiguration()} or a similar source.
     * Fully equivalent to {@code setConfiguration(configuration, null)}.
     *

     *
     * @return true when this instance is ad hoc, false when this instance is not ad hoc and can be cached.
     */
    boolean isAdHoc();

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

    /**
     * Returns the configuration with the given name. A component does not necessarily define any configurations.
     * <p>

    }

    @Override
    public String getGoal() {
        return delegate.getGoal();
    }

    @Override
    public Optional<XmlNode> getConfiguration() {
        return Optional.of(delegate.getConfiguration()).map(Xpp3Dom::getDom);
    }

    @Override
    public String toString() {
        return delegate.toString();
    }

        @Override
        @Nullable
        public ImmutableList<? extends ComponentArtifactMetadata> getConfigurationArtifacts(String configurationName) {
            ConfigurationMetadata configuration = metadata.getConfiguration(configurationName);
            if (configuration != null) {
                return configuration.getArtifacts();
            }
            return null;
        }
    }

public class Dependency {
    private final String configuration;

    public Dependency(String configuration) {
        this.configuration = configuration;
    }

    public String getConfiguration() {
        return configuration;
    }

// Accessing a provider
println(simpleMessageProvider.get())
// end::set-prov[]

// tag::introduction[]
abstract class MyIntroTask extends DefaultTask {
    @Input
    abstract Property<String> getConfiguration()

    @TaskAction
    void printConfiguration() {
        println "Configuration value: ${configuration.get()}"
    }
}

Provider<String> configurationProvider = project.provider { "Hello, Gradle!" }