setCollections() public method

Collections should be arrays or Traversable objects with name => path pairs
public setCollections ( array | Traversabl\Traversable $collections )
$collections array | Traversabl\Traversable
 /**
  * @expectedException \AssetManager\Exception\InvalidArgumentException
  */
 public function testSetCollectionFailsString()
 {
     $resolver = new CollectionResolver();
     $resolver->setCollections('invalid');
 }