Der `TestClient` macht unter der Haube magisches, um die asynchrone FastAPI-Anwendung in Ihren normalen `def`-Testfunktionen, mithilfe von Standard-Pytest aufzurufen. Aber diese Magie funktioniert nicht mehr, wenn wir sie in asynchronen Funktionen verwenden. Durch die asynchrone Ausführung unserer Tests können wir den `TestClient` nicht mehr in unseren Testfunktionen verwenden.

The `TestClient` does some magic inside to call the asynchronous FastAPI application in your normal `def` test functions, using standard pytest. But that magic doesn't work anymore when we're using it inside asynchronous functions. By running our tests asynchronously, we can no longer use the `TestClient` inside our test functions.

    - reference/openapi/docs.md
    - reference/openapi/models.md
  - reference/security/index.md
  - reference/encoders.md
  - reference/staticfiles.md
  - reference/templating.md
  - reference/testclient.md
- fastapi-people.md
- Resources:
  - resources/index.md
  - help-fastapi.md
  - contributing.md
  - project-generation.md
  - external-links.md
  - newsletter.md
  - management-tasks.md

Used by Starlette:

* <a href="https://www.python-httpx.org" target="_blank"><code>httpx</code></a> - Required if you want to use the `TestClient`.
* <a href="https://jinja.palletsprojects.com" target="_blank"><code>jinja2</code></a> - Required if you want to use the default template configuration.

* [Upgraded Starlette](https://github.com/encode/starlette/releases/tag/0.21.0)
    * Now the `TestClient` is based on HTTPX instead of Requests. 🚀