```Python hl_lines="2  12  15-18"
{!../../docs_src/app_testing/tutorial001.py!}
```

/// tip | "豆知識"

テスト関数は `async def` ではなく、通常の `def` であることに注意してください。

また、クライアントへの呼び出しも通常の呼び出しであり、`await` を使用しません。

これにより、煩雑にならずに、`pytest` を直接使用できます。

///

/// note | "技術詳細"

`from starlette.testclient import TestClient` も使用できます。

		}
	}

	rulesMap := event.NewRulesMap(eventNames, pattern, event.TargetID{ID: mustGetUUID()})

	setEventStreamHeaders(w)

	// Listen Publisher and peer-listen-client uses nonblocking send and hence does not wait for slow receivers.
	// Use buffered channel to take care of burst sends or slow w.Write()
	mergeCh := make(chan []byte, globalAPIConfig.getRequestsPoolCapacity()*len(globalEndpoints.Hostnames()))

	# Start Daemon
	start-stop-daemon -d $FESS_HOME --start -b --user "$FESS_USER" -c "$FESS_USER" --pidfile "$PID_FILE" --exec $DAEMON -- $DAEMON_OPTS
	return=$?
	if [ $return -eq 0 ]; then
		i=0
		timeout=10
		# Wait for the process to be properly started before exiting
		until { kill -0 `cat "$PID_FILE"`; } >/dev/null 2>&1
		do
			sleep 1
			i=$(($i + 1))
			if [ $i -gt $timeout ]; then
				log_end_msg 1
				exit 1

It doesn't matter. **FastAPI** will know what to do.

/// note

If you don't know, check the [Async: *"In a hurry?"*](../../async.md#in-a-hurry){.internal-link target=_blank} section about `async` and `await` in the docs.

///

## Integrated with OpenAPI

All the request declarations, validations and requirements of your dependencies (and sub-dependencies) will be integrated in the same OpenAPI schema.

	}
	if len(gots) != len(wants) {
		t.Fatalf("Expected %d objects but got %d", len(wants), len(gots))
	}

	// Close expiry state's channel to inspect object versions enqueued for expiration
	close(workers[0])
	wg.Wait()
	for _, obj := range expired {
		switch obj.ObjectV.VersionID {
		case uuids[2].String(), uuids[3].String(), uuids[4].String():
		default:
			t.Errorf("Unexpected versionID being expired: %#v\n", obj)
		}
	}

          object : WebSocketListener() {
            override fun onOpen(
              webSocket: WebSocket,
              response: Response,
            ) {
              try {
                latch.await() // The server can't respond to pings!
              } catch (e: InterruptedException) {
                throw AssertionError(e)
              }
            }
          },
        )
        .build(),
    )

def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Or use <code>async def</code>...</summary>

If your code uses `async` / `await`, use `async def`:

```Python hl_lines="9  14"
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def read_root():
    return {"Hello": "World"}

def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>또는 <code>async def</code> 사용하기...</summary>

여러분의 코드가 `async` / `await`을 사용한다면, `async def`를 사용하십시오.

```Python hl_lines="9 14"
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def read_root():

		close(writer.payloadCh)
		// Wait until the `start` go-routine is done.
		<-writer.doneCh
		return nil
	}
}

func (writer *messageWriter) FinishWithError(errorCode, errorMessage string) error {
	select {
	case <-writer.doneCh:
		return fmt.Errorf("messageWriter is done")
	case writer.errCh <- newErrorMessage([]byte(errorCode), []byte(errorMessage)):
		// Wait until the `start` go-routine is done.

def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Or use <code>async def</code>...</summary>

If your code uses `async` / `await`, use `async def`:

```Python hl_lines="9  14"
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def read_root():
    return {"Hello": "World"}