public function testUpdateRemovesScope()
 {
     $car = new Car();
     $car->color = 'red';
     $car->save();
     $dbCar = Vehicle::where('color', 'red')->first();
     $dbCar->color = 'green';
     $this->assertTrue($dbCar->save());
     // if the scope doesn't remove bindings this save will throw an exception.
 }