public class ManagedFactories {
    public static class ConfigurableFileCollectionManagedFactory implements ManagedFactory {
        private static final Class<?> PUBLIC_TYPE = ConfigurableFileCollection.class;
        public static final int FACTORY_ID = Objects.hashCode(PUBLIC_TYPE.getName());

        private final FileCollectionFactory fileCollectionFactory;

        public ConfigurableFileCollectionManagedFactory(FileCollectionFactory fileCollectionFactory) {

import static org.gradle.api.internal.file.ManagedFactories.RegularFilePropertyManagedFactory;
import static org.gradle.api.internal.file.collections.ManagedFactories.ConfigurableFileCollectionManagedFactory;
import static org.gradle.api.internal.provider.ManagedFactories.ListPropertyManagedFactory;
import static org.gradle.api.internal.provider.ManagedFactories.MapPropertyManagedFactory;

        given:
        _ * managedFactoryRegistry.lookup(org.gradle.api.internal.file.collections.ManagedFactories.ConfigurableFileCollectionManagedFactory.FACTORY_ID) >> new org.gradle.api.internal.file.collections.ManagedFactories.ConfigurableFileCollectionManagedFactory(TestFiles.fileCollectionFactory())

        expect:
        def isolatedEmpty = isolatableFactory.isolate(empty)

        return new DefaultManagedFactoryRegistry(parent).withFactories(
            new ManagedFactories.ConfigurableFileCollectionManagedFactory(fileCollectionFactory),
            new org.gradle.api.internal.file.ManagedFactories.RegularFilePropertyManagedFactory(filePropertyFactory),

    @Override
    public void disallowUnsafeRead() {
        valueState.disallowUnsafeRead();
    }

    @Override
    public int getFactoryId() {
        return ManagedFactories.ConfigurableFileCollectionManagedFactory.FACTORY_ID;
    }

    @Override
    public String getDisplayName() {
        return displayName == null ? "file collection" : displayName;
    }

    @Override