`TestClient`는 <a href="https://www.python-httpx.org" class="external-link" target="_blank">HTTPX</a>를 기반으로 하고 있으며, 다행히 이를 직접 사용하여 API를 테스트할 수 있습니다.

## 예시

간단한 예시를 위해 [더 큰 어플리케이션 만들기](../ko/tutorial/bigger-applications.md){.internal-link target=_blank} 와 [테스트](../ko/tutorial/testing.md){.internal-link target=_blank}:에서 다룬 파일 구조와 비슷한 형태를 확인해봅시다:

```
.
├── app
│   ├── __init__.py
│   ├── main.py
│   └── test_main.py

      - tutorial/security/simple-oauth2.md
      - tutorial/security/oauth2-jwt.md
    - tutorial/middleware.md
    - tutorial/cors.md
    - tutorial/sql-databases.md
    - tutorial/bigger-applications.md
    - tutorial/background-tasks.md
    - tutorial/metadata.md
    - tutorial/static-files.md
    - tutorial/testing.md
    - tutorial/debugging.md
  - Advanced User Guide:

Antes de eso, solo soportaba la palabra clave `example` con un solo ejemplo. Eso aún es soportado por OpenAPI 3.1.0, pero está obsoleto y no es parte del estándar de JSON Schema. Así que se recomienda migrar de `example` a `examples`. 🤓

Puedes leer más al final de esta página.

///

## Argumentos adicionales en `Field`

Cuando usas `Field()` con modelos de Pydantic, también puedes declarar `examples` adicionales:

///

## 🎏 💯

🎰 🈸, 👆 🎲 🔜 ✔️ 👆 💯 🎏 📁.

& 👆 **FastAPI** 🈸 5️⃣📆 ✍ 📚 📁/🕹, ♒️.

### **FastAPI** 📱 📁

➡️ 💬 👆 ✔️ 📁 📊 🔬 [🦏 🈸](bigger-applications.md){.internal-link target=_blank}:

```
.
├── app
│   ├── __init__.py
│   └── main.py
```

📁 `main.py` 👆 ✔️ 👆 **FastAPI** 📱:


{* ../../docs_src/app_testing/main.py *}

func (e PartTooSmall) Error() string {
	return fmt.Sprintf("Part size for %d should be at least 5MB", e.PartNumber)
}

// PartTooBig returned if size of part is bigger than the allowed limit.
type PartTooBig struct{}

func (e PartTooBig) Error() string {
	return "Part size bigger than the allowed limit"
}

// InvalidETag error returned when the etag has changed on disk
type InvalidETag struct{}

## Caveat { #caveat }

If you need to perform heavy background computation and you don't necessarily need it to be run by the same process (for example, you don't need to share memory, variables, etc), you might benefit from using other bigger tools like <a href="https://docs.celeryq.dev" class="external-link" target="_blank">Celery</a>.

The response object will also have autocompletion:

<img src="/img/tutorial/generate-clients/image05.png">

## FastAPI App with Tags { #fastapi-app-with-tags }

In many cases, your FastAPI app will be bigger, and you will probably use tags to separate different groups of *path operations*.

For example, you could have a section for **items** and another section for **users**, and they could be separated by tags:

Así, podrías, por ejemplo, compartir los mismos datos de una aplicación de Django en una base de datos con una aplicación de FastAPI. O migrar gradualmente una aplicación de Django usando la misma base de datos.

Y tus usuarios podrían iniciar sesión desde tu aplicación Django o desde tu aplicación **FastAPI**, al mismo tiempo.

///

The client will get a **500 Internal Server Error** for that request, but the application will continue working for the next requests instead of just crashing completely.

### Bigger Errors - Crashes { #bigger-errors-crashes }

Nevertheless, there might be cases where we write some code that **crashes the entire application** making Uvicorn and Python crash. 💥

        request = new Smb2NegotiateRequest(mockConfig, 0);

        // When
        int size = request.size();

        // Then - should include context sizes
        assertTrue(size > 112); // Bigger than without contexts
        assertEquals(0, size % 8); // Should be 8-byte aligned
    }

    @Test
    @DisplayName("Should write bytes to wire format correctly")
    void testWriteBytesWireFormat() {