public function testHasManyKey()
{
$config = array('from' => $this->_gallery, 'to' => $this->_image, 'type' => 'hasMany', 'fieldName' => 'images');
$relation = new Relationship($config + array('key' => 'gallery_id'));
$expected = array('id' => 'gallery_id');
$this->assertEqual($expected, $relation->key());
$relation = new Relationship($config + array('key' => array('id' => 'gallery_id')));
$this->assertEqual($expected, $relation->key());
}