"(function() {" +
                    "var mql = window.matchMedia('(prefers-color-scheme: dark)');" +
                    "var hljsEl = document.getElementById('hljs-theme');" +
                    "function applyTheme(dark) {" +
                    "var t = dark ? 'dark' : 'light';" +
                    "document.documentElement.setAttribute('data-theme', t);" +

Veamos cómo podemos hacer que esto funcione.

## pytest.mark.anyio { #pytest-mark-anyio }

Voyons comment procéder.

## pytest.mark.anyio { #pytest-mark-anyio }

import pytest

from docs_src.async_tests.app_a_py310.test_main import test_root


@pytest.mark.anyio
async def test_async_testing():

app = FastAPI()


@app.post("/cookie-and-object/")
def create_cookie(response: Response):
    response.set_cookie(key="fakesession", value="fake-cookie-session-value")

     * @return true if completed, false otherwise
     */
    public boolean isCompleted() {
        return completed;
    }

    /**
     * Mark request as completed
     */
    public void markCompleted() {
        this.completed = true;
    }

    /**
     * Mark request as failed with error
     *
     * @param error exception that caused the failure
     */
    public void markFailed(Exception error) {

  palette:
    - media: "(prefers-color-scheme: light)"
      scheme: default
      primary: teal
      accent: blue
      toggle:
        icon: octicons/sun-24
        name: "Switch to Dark Mode"
    - media: "(prefers-color-scheme: dark)"
      scheme: slate
      primary: teal
      accent: blue
      toggle:
        icon: octicons/moon-24
        name: "Switch to Light Mode"
  features:
  - navigation.tabs

Uygulama kodunuz da şuna benzer bir şey yapar:

```Python
if "stanleyjobsox" == "stanleyjobson" and "love123" == "swordfish":
    ...
```

Bu kez Python, iki string’in aynı olmadığını fark etmeden önce hem `stanleyjobsox` hem de `stanleyjobson` içinde `stanleyjobso` kısmının tamamını karşılaştırmak zorunda kalır. Bu nedenle "Incorrect username or password" yanıtını vermesi birkaç mikro saniye daha uzun sürer.

import pytest
from typer.testing import CliRunner

from scripts.translation_fixer import cli

data_path = Path(
    "scripts/tests/test_translation_fixer/test_complex_doc/data"
).absolute()


@pytest.mark.parametrize(
    "copy_test_files",
    [(f"{data_path}/en_doc.md", f"{data_path}/translated_doc.md")],
    indirect=True,
)
def test_fix(runner: CliRunner, root_dir: Path, copy_test_files):
    result = runner.invoke(

您已经了解了如何使用 `TestClient` 测试 **FastAPI** 应用程序。但是到目前为止，您只了解了如何编写同步测试，而没有使用 `async` 异步函数。

在测试中能够使用异步函数可能会很有用，比如当您需要异步查询数据库的时候。想象一下，您想要测试向 FastAPI 应用程序发送请求，然后验证您的后端是否成功在数据库中写入了正确的数据，与此同时您使用了异步的数据库的库。

让我们看看如何才能实现这一点。

## pytest.mark.anyio { #pytest-mark-anyio }

如果我们想在测试中调用异步函数，那么我们的测试函数必须是异步的。 AnyIO 为此提供了一个简洁的插件，它允许我们指定一些测试函数要异步调用。

## HTTPX { #httpx }

即使您的 **FastAPI** 应用程序使用普通的 `def` 函数而不是 `async def` ，它本质上仍是一个 `async` 异步应用程序。