import org.gradle.internal.service.DefaultServiceLocator;

import java.util.List;
import java.util.Set;

class GradleApiSpecAggregator {

    private final ClassLoader classLoader;
    private final Instantiator instantiator;

    public GradleApiSpecAggregator(ClassLoader classLoader, Instantiator instantiator) {
        this.classLoader = classLoader;
        this.instantiator = instantiator;
    }

        1 * classLoader.loadClass(SpecProvider1.class.name) >> SpecProvider1
        1 * classLoader.loadClass(SpecProvider2.class.name) >> SpecProvider2

        def subject = new GradleApiSpecAggregator(classLoader, DirectInstantiator.INSTANCE)

        when:
        def aggregate = subject.aggregate()

        then:
        aggregate.exportedResourcePrefixes == setOf("META-INF/gradle-plugins")

    }

    private FilteringClassLoader.Spec apiSpecFor(ClassLoader classLoader) {
        FilteringClassLoader.Spec apiSpec = new FilteringClassLoader.Spec();
        GradleApiSpecProvider.Spec apiAggregate = new GradleApiSpecAggregator(classLoader, instantiator).aggregate();
        for (String resource : apiAggregate.getExportedResources()) {
            apiSpec.allowResource(resource);
        }