<div class="screenshot">
<img src="/img/tutorial/separate-openapi-schemas/image02.png">
</div>

Isso significa que ele **sempre terá um valor**, só que às vezes o valor pode ser `None` (ou `null` em termos de JSON).

Isso quer dizer que, os clientes que usam sua API não precisam verificar se o valor existe ou não, eles podem **assumir que o campo sempre estará lá**, mas que em alguns casos terá o valor padrão de `None`.

<div class="termy">

```console
$ pip install pytest

---> 100%
```

</div>

Ele detectará os arquivos e os testes automaticamente, os executará e informará os resultados para você.

Execute os testes com:

<div class="termy">

```console
$ pytest

================ test session starts ================

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.keymatch;

/**
 * @author codelibs
 * @author jflute
 */
public class SearchForm {

    public String term;

    public String query;

 */
package org.codelibs.fess.app.web.api.admin.relatedcontent;

import org.codelibs.fess.app.web.api.admin.BaseSearchBody;

public class SearchBody extends BaseSearchBody {

    public String term;

    public String content;

            "type" : "keyword"
          },
          "createdTime" : {
            "type" : "long"
          },
          "queries" : {
            "type" : "keyword"
          },
          "term" : {
            "type" : "keyword"
          },
          "updatedBy" : {
            "type" : "keyword"
          },
          "updatedTime" : {
            "type" : "long"
          },

* This means that it will work well for large files like images, videos, large binaries, etc. without consuming all the memory.
* You can get metadata from the uploaded file.
* It has a <a href="https://docs.python.org/3/glossary.html#term-file-like-object" class="external-link" target="_blank">file-like</a> `async` interface.

## Tests ausführen

Danach müssen Sie nur noch `pytest` installieren:

<div class="termy">

```console
$ pip install pytest

---> 100%
```

</div>

Es erkennt die Dateien und Tests automatisch, führt sie aus und berichtet Ihnen die Ergebnisse.

Führen Sie die Tests aus, mit:

<div class="termy">

```console
$ pytest

================ test session starts ================

每個部分都是在前一部分的基礎上逐步建置的，但內容結構是按主題分開的，因此你可以直接跳到任何特定的部分，解決你具體的 API 需求。

它也被設計成可作為未來的參考，讓你隨時回來查看所需的內容。

## 運行程式碼

所有程式碼區塊都可以直接複製和使用（它們實際上是經過測試的 Python 檔案）。

要運行任何範例，請將程式碼複製到 `main.py` 檔案，並使用以下命令啟動 `fastapi dev`：

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:single">main.py</u>
<font color="#3465A4">INFO    </font> Using path <font color="#3465A4">main.py</font>

## Запуск тестов

Далее Вам нужно установить `pytest`:

<div class="termy">

```console
$ pip install pytest

---> 100%
```

</div>

Он автоматически найдёт все файлы и тесты, выполнит их и предоставит Вам отчёт о результатах тестирования.

Запустите тесты командой `pytest` и увидите результат:

<div class="termy">

```console
$ pytest

Die einfachste FastAPI-Datei könnte wie folgt aussehen:

```Python
{!../../docs_src/first_steps/tutorial001.py!}
```

Kopieren Sie dies in eine Datei `main.py`.

Starten Sie den Live-Server:

<div class="termy">

```console
$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)