It's still possible to use `BackgroundTask` alone in FastAPI, but you have to create the object in your code and return a Starlette `Response` including it.

  "UNUSED_VALUE",
  "UNUSED_VARIABLE",
  "VARIABLE_WITH_REDUNDANT_INITIALIZER",
)
class KotlinDeprecationErrorTest {
  private val factory = TestValueFactory()

  @AfterEach
  fun tearDown() {
    factory.close()
  }

  @Test @Disabled
  fun address() {
    val address: Address = factory.newAddress()
    val url: HttpUrl = address.url()
    val dns: Dns = address.dns()

       * running under Jelly Bean or higher. But it seems safest to check.
       */
      if (version < jellyBean) {
        return new ThrowingCreator();
      }

      // Don't merge these catch() blocks, let alone use ReflectiveOperationException directly:
      // b/65343391
    } catch (NoSuchFieldException e) {
      // The JELLY_BEAN field doesn't exist because we're running on a version before Jelly Bean :)

    @AfterEach
    public void tearDown() throws Exception {
        if (directoryLeaseManager != null) {
            directoryLeaseManager.shutdown();
        }
        if (mocks != null) {
            mocks.close();
        }
    }

    @Test
    public void testRequestDirectoryLease() {
        String directoryPath = "/test/dir";
        int requestedState = DirectoryLeaseState.DIRECTORY_READ_HANDLE;

        totalAttemptsBlocked.set(0);
        totalAccountsLocked.set(0);
        totalIpsBlocked.set(0);
        log.info("Rate limiter state reset");
    }

    @Override
    public void close() {
        if (!closed.compareAndSet(false, true)) {
            return;
        }

        cleanupScheduler.shutdownNow();
        try {
            cleanupScheduler.awaitTermination(5, TimeUnit.SECONDS);

            connectionMonitorTask.cancel();
        }
        if (httpClient != null) {
            try {
                httpClient.close();
            } catch (final IOException e) {
                logger.error("Failed to close httpClient.", e);
            }
            httpClient = null;
            if (clientConnectionManager != null) {
                clientConnectionManager.shutdown();
            }
        }

    public List<Restriction> getRestrictions() {
        return restrictions;
    }

    /**
     * @deprecated VersionRange is immutable, cloning is not useful and even more an issue against the cache
     * @return a clone
     */
    @Deprecated
    public VersionRange cloneOf() {
        List<Restriction> copiedRestrictions = null;

        if (restrictions != null) {
            copiedRestrictions = new ArrayList<>();

             * because we might close the socket during a
             * request. However the chances are slim and the
             * retry code should ensure the overall request
             * is serviced. The alternative complicates things
             * more than I think is worth it.
             */

            if (this.socket != null) {
                this.socket.close();
                this.socket = null;

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