CompositeDomainObjectSet<T> out = new CompositeDomainObjectSet<T>(delegate, callbackActionDecorator);
        for (DomainObjectCollection<? extends T> c : collections) {
            out.addCollection(c);
        }
        return out;
    }

    private CompositeDomainObjectSet(DefaultDomainObjectSet<T> delegate, CollectionCallbackActionDecorator callbackActionDecorator) {

import org.gradle.api.component.SoftwareComponent;
import org.gradle.api.file.Directory;
import org.gradle.api.internal.CollectionCallbackActionDecorator;
import org.gradle.api.internal.CompositeDomainObjectSet;
import org.gradle.api.internal.artifacts.DefaultModuleVersionIdentifier;
import org.gradle.api.internal.artifacts.Module;
import org.gradle.api.internal.artifacts.configurations.DependencyMetaDataProvider;

        entries.each { collection.add(it) }
        collection
    }

    protected composite(DomainObjectCollection... collections) {
        CompositeDomainObjectSet.create(type, *collections)
    }

    def "empty composite contains no elements"() {
        expect:
        composite().empty
    }

    def "composite containing one collection"() {
        expect: