Tests Collection accessors (getters/setters).

Source

						public function testAccessorMethods() {
		Connections::config(array('mock-source' => array(
			'type' => 'lithium\tests\mocks\data\MockSource'
		)));
		$model = $this->_model;
		$model::config(array('connection' => false, 'key' => 'id'));
		$collection = new DocumentSet(compact('model'));
		$this->assertEqual($model, $collection->model());
		$this->assertEqual(compact('model'), $collection->meta());
	}