{!../../docs_src/async_tests/test_main.py!}
```

/// tip

🗒 👈 💯 🔢 🔜 `async def` ↩️ `def` ⏭ 🕐❔ ⚙️ `TestClient`.

///

⤴️ 👥 💪 ✍ `AsyncClient` ⏮️ 📱, & 📨 🔁 📨 ⚫️, ⚙️ `await`.

```Python hl_lines="9-12"
{!../../docs_src/async_tests/test_main.py!}
```

👉 🌓:

```Python
response = client.get('/')
```

...👈 👥 ⚙️ ⚒ 👆 📨 ⏮️ `TestClient`.

/// tip

🗒 👈 👥 ⚙️ 🔁/⌛ ⏮️ 🆕 `AsyncClient` - 📨 🔁.

│   ├── main.py
│   ├── dependencies.py
│   └── routers
│   │   ├── __init__.py
│   │   ├── items.py
│   │   └── users.py
│   └── internal
│       ├── __init__.py
│       └── admin.py
```

/// tip

📤 📚 `__init__.py` 📁: 1️⃣ 🔠 📁 ⚖️ 📁.

👉 ⚫️❔ ✔ 🏭 📟 ⚪️➡️ 1️⃣ 📁 🔘 ➕1️⃣.

🖼, `app/main.py` 👆 💪 ✔️ ⏸ 💖:

```
from app.routers import items
```

///

```

////

//// tab | Python 3.10+ non-Annotated

/// tip | "Dica"

Prefira usar a versão `Annotated` se possível.

///

```Python
{!> ../../docs_src/app_testing/app_b_py310/main.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip | "Dica"

Prefira usar a versão `Annotated` se possível.

///

```Python

{!../../docs_src/app_testing/tutorial001.py!}
```

/// tip | "提示"

注意测试函数是普通的 `def`，不是 `async def`。

还有client的调用也是普通的调用，不是用 `await`。

这让你可以直接使用 `pytest` 而不会遇到麻烦。

///

/// note | "技术细节"

你也可以用 `from starlette.testclient import TestClient`。

**FastAPI** 提供了和 `starlette.testclient` 一样的 `fastapi.testclient`，只是为了方便开发者。但它直接来自Starlette。

///

/// tip | "提示"

## Em Detalhes

O marcador `@pytest.mark.anyio` informa ao pytest que esta função de teste deve ser invocada de maneira assíncrona:

```Python hl_lines="7"
{!../../docs_src/async_tests/test_main.py!}
```

/// tip | "Dica"

Note que a função de teste é `async def` agora, no lugar de apenas `def` como quando estávamos utilizando o `TestClient` anteriormente.

///

```

////

//// tab | Python 3.8+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="1  4-6" title="app/dependencies.py"
{!> ../../docs_src/bigger_applications/app/dependencies.py!}
```

////

/// tip

We are using an invented header to simplify this example.

            // More stuff here
    }
}
```

/// tip

👀 🚘-🏗 💽 ⏮️ `url` 💲 `/api/v1`, ✊ ⚪️➡️ `root_path`.

///

🩺 🎚 <a href="http://127.0.0.1:9999/api/v1/docs" class="external-link" target="_blank">http://127.0.0.1:9999/api/v1/docs</a> ⚫️ 🔜 👀 💖:

<img src="/img/tutorial/behind-a-proxy/image03.png">

/// tip

🩺 🎚 🔜 🔗 ⏮️ 💽 👈 👆 🖊.

///

{!> ../../docs_src/websockets/tutorial002_an.py!}
```

////

//// tab | Python 3.10+ 非带注解版本

/// tip

如果可能，请尽量使用 `Annotated` 版本。

///

```Python hl_lines="66-67  79"
{!> ../../docs_src/websockets/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+ 非带注解版本

/// tip

如果可能，请尽量使用 `Annotated` 版本。

///

```Python hl_lines="68-69  81"

<img src="/img/tutorial/body/image05.png">

/// tip | "Tipp"

---> 100%
```

</div>

## In Detail

The marker `@pytest.mark.anyio` tells pytest that this test function should be called asynchronously:

{* ../../docs_src/async_tests/test_main.py hl[7] *}

/// tip

Note that the test function is now `async def` instead of just `def` as before when using the `TestClient`.

///

Then we can create an `AsyncClient` with the app, and send async requests to it, using `await`.