}

    /**
     * Formats a file size in bytes to a human-readable string with appropriate units.
     *
     * @param value the file size in bytes
     * @return formatted file size string (e.g., "1.5M", "2.3G", "512K")
     */
    public static String formatFileSize(final long value) {
        double target = value;
        String unit = ""; // TODO l10n?
        String format = "0.#";
        if (value < 1024) {

    // [x509_extensions]
    // subjectAltName=DNS:localhost.localdomain,DNS:localhost,IP:127.0.0.1
    //
    // $ openssl req -x509 -nodes -days 36500 -subj '/CN=localhost' -config ./cert.cnf \
    //     -newkey rsa:512 -out cert.pem
    val certificate =
      certificate(
        """
        -----BEGIN CERTIFICATE-----
        MIIBWDCCAQKgAwIBAgIJANS1EtICX2AZMA0GCSqGSIb3DQEBBQUAMBQxEjAQBgNV

  }

  /** Returns a hash function implementing the SHA-512 algorithm (512 hash bits). */
  public static HashFunction sha512() {
    return Sha512Holder.SHA_512;
  }

  private static final class Sha512Holder {
    static final HashFunction SHA_512 =
        new MessageDigestHashFunction("SHA-512", "Hashing.sha512()");
  }

  /**

  }

  /** Returns a hash function implementing the SHA-512 algorithm (512 hash bits). */
  public static HashFunction sha512() {
    return Sha512Holder.SHA_512;
  }

  private static final class Sha512Holder {
    static final HashFunction SHA_512 =
        new MessageDigestHashFunction("SHA-512", "Hashing.sha512()");
  }

  /**

  fun decodeRsa512() {
    // The certificate + private key below was generated with OpenSSL. Never generate certificates
    // with MD5 or 512-bit RSA; that's insecure!
    //
    // openssl req \
    //   -x509 \
    //   -md5 \
    //   -nodes \
    //   -days 1 \
    //   -newkey rsa:512 \
    //   -keyout privateKey.key \
    //   -out certificate.crt
    val certificatePem =
      """

    CacheBuilder<Object, Object> builder =
        CacheBuilder.newBuilder().initialCapacity(512).maximumSize(Long.MAX_VALUE);
    LocalCache<?, ?> cache = ((LocalCache.LocalManualCache<?, ?>) builder.build()).localCache;
    assertThat(cache.segments.length * cache.segments[0].table.length()).isEqualTo(512);
  }

  @GwtIncompatible // maximumWeight
  public void testMaximumWeight_negative() {

    CacheBuilder<Object, Object> builder =
        CacheBuilder.newBuilder().initialCapacity(512).maximumSize(Long.MAX_VALUE);
    LocalCache<?, ?> cache = ((LocalCache.LocalManualCache<?, ?>) builder.build()).localCache;
    assertThat(cache.segments.length * cache.segments[0].table.length()).isEqualTo(512);
  }

  @GwtIncompatible // maximumWeight
  public void testMaximumWeight_negative() {

          Thread.sleep(100)
        }
      } catch (e: IOException) {
        break
      }
      i++
    }
    // Halfway +/- 0.5%
    assertThat(i.toFloat()).isCloseTo(512f, 5f)
  }

  @Test
  fun disconnectResponseHalfway() {
    server.enqueue(
      MockResponse()
        .setBody("ab")
        .setSocketPolicy(SocketPolicy.DISCONNECT_DURING_RESPONSE_BODY),
    )

    assertHashBytesThrowsCorrectExceptions(hashFunction);
    assertIndependentHashers(hashFunction);
    assertShortcutsAreEquivalent(hashFunction, 512);
  }

  static void assertHashByteBufferInvariants(HashFunction hashFunction) {
    assertHashByteBufferMatchesBytes(hashFunction);
    assertHashByteBufferExhaustsBuffer(hashFunction);

          Thread.sleep(100)
        }
      } catch (e: IOException) {
        break
      }
      i++
    }
    // Halfway +/- 0.5%
    assertThat(i.toFloat()).isCloseTo(512f, 5f)
  }

  @Test
  fun disconnectResponseHalfway() {
    server.enqueue(
      MockResponse
        .Builder()
        .body("ab")
        .onResponseBody(CloseSocket())
        .build(),