*
 * Prevents users from accessing "internal" methods on implementations.
 */
@NonExtensible
public class CopySpecWrapper implements SyncSpec {

    @VisibleForTesting
    final SyncSpec delegate;

    @Inject
    public CopySpecWrapper(SyncSpec delegate) {
        this.delegate = delegate;
    }

    @Override
    public boolean isCaseSensitive() {

Accessors for org.gradle.api.internal.artifacts.dependencies.AbstractModuleDependency.targetConfiguration don't use symmetrical @Nullable
Accessors for org.gradle.api.internal.file.copy.CopySpecWrapper.dirMode don't use symmetrical @Nullable
Accessors for org.gradle.api.internal.file.copy.CopySpecWrapper.fileMode don't use symmetrical @Nullable
Accessors for org.gradle.api.internal.file.copy.DefaultCopySpec.dirMode don't use symmetrical @Nullable

        DestinationRootCopySpec destinationRootCopySpec = new DestinationRootCopySpec(fileResolver, copySpec);
        SyncSpec wrapped = instantiator.newInstance(CopySpecWrapper.class, destinationRootCopySpec);
        action.execute(wrapped);
        return destinationRootCopySpec;
    }

    public WorkResult copy(Action<? super CopySpec> action) {

        CopySpecInternal child = addChild();
        child.from(sourcePath);
        CopySpecWrapper wrapper = instantiator.newInstance(CopySpecWrapper.class, child);
        configureAction.execute(wrapper);
        return wrapper;
    }

    @Override
    public CopySpecInternal addFirst() {
        return addChildAtPosition(0);

        otherSpec.addChild().addChild()

        then:
        added == ['$2$2', '$2$2$1']
    }

    private static DefaultCopySpec unpackWrapper(CopySpec copySpec) {
        (copySpec as CopySpecWrapper).delegate as DefaultCopySpec
    }

    private static RelativePath relativeDirectory(String... segments) {
        new RelativePath(false, segments)
    }