Nelmio\Alice\FixtureBag::has PHP Method

    public function has(string $id) : bool
    {
        return array_key_exists($id, $this->fixtures);
    }

 public function getTemplate(string $id) : FixtureInterface
 {
     if ($this->templates->has($id)) {
         return $this->templates->get($id);
     }
     throw FixtureNotFoundExceptionFactory::create($id);
 }