import java.util.concurrent.TimeoutException;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link AbstractExecutionThreadService}.
 *
 * @author Jesse Wilson
 */
@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class AbstractExecutionThreadServiceTest extends TestCase {

  private final TearDownStack tearDownStack = new TearDownStack(true);

Por supuesto, usarías las mismas ideas que leíste en [Acerca de las versiones de FastAPI](versions.md) para establecer los rangos de versiones.

Por ejemplo, tu `requirements.txt` podría verse así:

```
fastapi[standard]>=0.113.0,<0.114.0
pydantic>=2.7.0,<3.0.0
```

Y normalmente instalarías esas dependencias de los paquetes con `pip`, por ejemplo:

<div class="termy">

```console

  `She can't explain it,' said the Gryphon hastily.  `Go on with
the next verse.'

  `But about his toes?' the Mock Turtle persisted.  `How COULD
he turn them out with his nose, you know?'

  `It's the first position in dancing.' Alice said; but was
dreadfully puzzled by the whole thing, and longed to change the
subject.

  `Go on with the next verse,' the Gryphon repeated impatiently:
`it begins "I passed by his garden."'

 * callbacks. Its subclasses must manage threads manually; consider {@link
 * AbstractExecutionThreadService} if you need only a single execution thread.
 *
 * @author Jesse Wilson
 * @author Luke Sandberg
 * @since 1.0
 */
@GwtIncompatible
@J2ktIncompatible
public abstract class AbstractService implements Service {
  private static final ListenerCallQueue.Event<Listener> STARTING_EVENT =

              }

              println("Authenticating for response: $response")
              println("Challenges: ${response.challenges()}")
              val credential = Credentials.basic("jesse", "password1")
              return response.request.newBuilder()
                  .header("Authorization", credential)
                  .build()
            }
          })
          .build()

### Usar el SDK { #using-the-sdk }

Ahora puedes importar y usar el código del cliente. Podría verse así, nota que tienes autocompletado para los métodos:

<img src="/img/tutorial/generate-clients/image02.png">

También obtendrás autocompletado para el payload a enviar:

# CL 93550043 math/big: implement Rat.Float32, Robert Griesemer <******@****.***>
pkg math/big, method (*Rat) Float32() (float32, bool)

# CL 76540043 net/http: add BasicAuth method to *http.Request, Kelsey Hightower <kelsey******@****.***>
pkg net/http, method (*Request) BasicAuth() (string, string, bool)

# CL 137940043 net/http: add Transport.DialTLS hook, Brad Fitzpatrick <******@****.***>

import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link AbstractService}.
 *
 * @author Jesse Wilson
 */
@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class AbstractServiceTest extends TestCase {

  private static final long LONG_TIMEOUT_MILLIS = 10000;
  private Thread executionThread;

import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link AbstractService}.
 *
 * @author Jesse Wilson
 */
@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class AbstractServiceTest extends TestCase {

  private static final long LONG_TIMEOUT_MILLIS = 10000;
  private Thread executionThread;

  }

  private fun postBodyRetransmittedAfterAuthorizationFail(body: String) {
    server.enqueue(
      MockResponse(code = 401),
    )
    server.enqueue(MockResponse())
    val credential = basic("jesse", "secret")
    client =
      client
        .newBuilder()
        .authenticator(RecordingOkAuthenticator(credential, null))
        .build()
    val response =
      getResponse(
        Request(