Helper 함수 - app()

app() 
- The app function returns the service container instance: 

$container = app();

- You may pass a class or interface name to resolve it from the container:

$api = app('HelpSpot\API');

- 실제 코드 적용 예시
(실제 Searcher 클래스에 접근하여 사용)

    public function 주문_조회_실제()
    {
        $searcher = app(Searcher::class);
        $result = $searcher->search(new SearchRequest());
        $this->assertIsObject($result);
    }

 
참고
https://laravel.com/docs/10.x/helpers#method-app

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