/**
  * Tests `Collection::assignTo`.
  */
 public function testAssignTo()
 {
     $parent = new stdClass();
     $config = array('valid' => false, 'model' => $this->_model);
     $collection = new DocumentSet();
     $collection->assignTo($parent, $config);
     $this->assertEqual($this->_model, $collection->model());
     $this->assertEqual($parent, $collection->parent());
 }