for (int i : keys) {
      cache.getUnchecked(i);
    }
  }

  private Object objectWithHash(int hash) {
    return new Object() {
      @Override
      public int hashCode() {
        return hash;
      }
    };
  }

        SMBUtil.writeInt4(size, enc, 0);
        SMBUtil.writeInt4(0, enc, 4);
        System.arraycopy(customData, 0, enc, 8, 8);
        System.arraycopy(machineId, 0, enc, 16, 32);
        return enc;
    }

                type,
                classifier,
                remoteRepositories,
                null);

        this.downloadUrl = downloadUrl;
    }

    public String getDownloadUrl() {
        return downloadUrl;
    }

     * There are no predefined minimum or maximum values, but it's recommended
     * to use values that allow for future adjustments (e.g., using values
     * like 100, 200, 300 rather than consecutive numbers).
     *
     * @return the priority value for ordering
     */
    int value();

    // TODO(jwilson): can I read the response body? Do I have to?
    System.out.println("onFailure " + response);
  }

  @Override public void close() throws IOException {
    if (webSocket == null) return;

    WebSocket webSocket;
    synchronized (this) {
      webSocket = this.webSocket;
    }

    if (webSocket != null) {
      webSocket.close(1000, "bye");
    }
  }

    protected SimpleForwardingListenableFuture(ListenableFuture<V> delegate) {
      this.delegate = Preconditions.checkNotNull(delegate);
    }

    @Override
    protected final ListenableFuture<V> delegate() {
      return delegate;
    }
  }

    }

    private File createTempFile(String name) throws IOException {
        File tempFile = File.createTempFile(name, ".xml");
        tempFile.deleteOnExit();
        return tempFile;
    }

        PluginDescriptor pd = get(key);
        if (pd == null) {
            pd = supplier.load();
            put(key, pd);
        }
        return pd;
    }

    void flush();

    private static MavenProject createProject(String id) {
        MavenProject result = new MavenProject();
        result.setGroupId("org.apache");
        result.setArtifactId(id);
        result.setVersion("1.2");
        return result;
    }

        builder = new ExtensionDescriptorBuilder();
    }

    @AfterEach
    void tearDown() throws Exception {
        builder = null;
    }

    private InputStream toStream(String xml) {
        return new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8));
    }

    @Test
    void testEmptyDescriptor() throws Exception {
        String xml = "<extension></extension>";