public function testPassingArgsToScope()
{
$frogs_by_type = Animal::all()->filter('id = ?', Animal::all()->last()->id)->by_type('frog');
$frogs = Animal::all()->filter('id = ?', Animal::all()->last()->id)->frogs();
$this->assertEquals($frogs->one()->name, $frogs_by_type->one()->name);
}