AssetManager\Resolver\CollectionResolver::setAggregateResolver PHP Method

    public function setAggregateResolver(ResolverInterface $aggregateResolver)
    {
        $this->aggregateResolver = $aggregateResolver;
    }

 public function getCollectionResolver()
 {
     $aggregateResolver = new AggregateResolver();
     $mockedResolver = $this->getResolver(__DIR__ . '/../../_files/require-jquery.js');
     $collArr = array('blah.js' => array('asset-path'));
     $resolver = new CollectionResolver($collArr);
     $resolver->setAggregateResolver($aggregateResolver);
     $aggregateResolver->attach($mockedResolver, 500);
     $aggregateResolver->attach($resolver, 1000);
     return $resolver;
 }