El `TestClient` hace algo de magia interna para llamar a la aplicación FastAPI asíncrona en tus funciones de test `def` normales, usando pytest estándar. Pero esa magia ya no funciona cuando lo usamos dentro de funciones asíncronas. Al ejecutar nuestros tests de manera asíncrona, ya no podemos usar el `TestClient` dentro de nuestras funciones de test.

      int n, @Nullable Entry<K, V>[] entryArray, boolean throwIfDuplicateKeys) {
    checkPositionIndex(n, entryArray.length);
    if (n == 0) {
      @SuppressWarnings("unchecked") // it has no entries so the type variables don't matter
      ImmutableMap<K, V> empty = (ImmutableMap<K, V>) EMPTY;
      return empty;
    }
    try {
      return fromEntryArrayCheckingBucketOverflow(n, entryArray, throwIfDuplicateKeys);

    for prod and one for tests. However, unlike our other packages, as of this
    writing it has test supersource but no prod supersource.

    GWT happens to use the prod .gwt.xml, so it looks for no supersource for
    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages

    }
  }

  /** No SNI for literal IPv6 addresses. */
  @Test
  fun ipv6() {
    val recordedRequest = requestToHostnameViaProxy("2607:f8b0:400b:804::200e")
    assertThat(recordedRequest.url.host).isEqualTo("2607:f8b0:400b:804::200e")
    assertThat(recordedRequest.handshakeServerNames).isEmpty()
  }

  /** No SNI for literal IPv4 addresses. */
  @Test
  fun ipv4() {

            throw new IOException("Error reading jcifs/smb1/util/mime.map resource");
        }
        is.close();
    }

    /**
     * Returns the MIME type for the given file extension.
     * If no mapping is found, returns "application/octet-stream" as the default.
     *
     * @param extension the file extension to look up (without the dot)

      appropriateness of using or redistributing the Work and assume any
      risks associated with Your exercise of permissions under this License.

   8. Limitation of Liability. In no event and under no legal theory,
      whether in tort (including negligence), contract, or otherwise,
      unless required by applicable law (such as deliberate and grossly

Las claves extra pasadas a `Field` también estarán presentes en el esquema de OpenAPI resultante para tu aplicación.
Como estas claves no necesariamente tienen que ser parte de la especificación de OpenAPI, algunas herramientas de OpenAPI, por ejemplo [el validador de OpenAPI](https://validator.swagger.io/), podrían no funcionar con tu esquema generado.

///

## Resumen

  public static void testSubtypeOfStaticAnonymousClass() {
    Class<?> superclass = new Mall<Outdoor>().new Shop<Electronics>() {}.getClass();
    assertTrue(TypeToken.of(superclass).isSubtypeOf(superclass));
    assertFalse(
        TypeToken.of(new Mall<Outdoor>().new Shop<Electronics>() {}.getClass())
            .isSubtypeOf(superclass));
  }

   *             impossible.
   *         <li>Test will fail if the constructor or factory method throws exception.
   *       </ul>
   *   <li>If there is no non-private constructor or non-private static factory method declared by
   *       {@code cls}, no test is performed.
   *   <li>Equality test is not performed on method return values unless the method is a non-private

/**
 * An empty iterator implementation for SMB resources.
 * This iterator contains no elements and immediately returns false for hasNext().
 *
 * @author mbechler
 */
public class EmptyIterator implements CloseableIterator<SmbResource> {

    /**
     * Default constructor for EmptyIterator.
     * Creates an empty iterator with no elements.
     */
    public EmptyIterator() {
        // Default constructor
    }