assertEquals(0x0000000099999999L, HashCode.fromBytesNoCopy(byteArrayWith9s(4)).padToLong());
  }

  public void testPadToLongWith6Bytes() {
    assertEquals(0x0000999999999999L, HashCode.fromBytesNoCopy(byteArrayWith9s(6)).padToLong());
  }

  public void testPadToLongWith8Bytes() {
    assertEquals(0x9999999999999999L, HashCode.fromBytesNoCopy(byteArrayWith9s(8)).padToLong());
  }

    assertEquals(0x0000000099999999L, HashCode.fromBytesNoCopy(byteArrayWith9s(4)).padToLong());
  }

  public void testPadToLongWith6Bytes() {
    assertEquals(0x0000999999999999L, HashCode.fromBytesNoCopy(byteArrayWith9s(6)).padToLong());
  }

  public void testPadToLongWith8Bytes() {
    assertEquals(0x9999999999999999L, HashCode.fromBytesNoCopy(byteArrayWith9s(8)).padToLong());
  }

    }

    @Override
    public HashCode hash() {
      checkNotDone();
      done = true;
      return (bytes == digest.getDigestLength())
          ? HashCode.fromBytesNoCopy(digest.digest())
          : HashCode.fromBytesNoCopy(Arrays.copyOf(digest.digest(), bytes));
    }
  }

    }

    @Override
    public HashCode hash() {
      checkNotDone();
      done = true;
      return (bytes == digest.getDigestLength())
          ? HashCode.fromBytesNoCopy(digest.digest())
          : HashCode.fromBytesNoCopy(Arrays.copyOf(digest.digest(), bytes));
    }
  }

    return fromBytesNoCopy(bytes.clone());
  }

  /**
   * Creates a {@code HashCode} from a byte array. The array is <i>not</i> copied defensively, so it
   * must be handed-off so as to preserve the immutability contract of {@code HashCode}.
   */
  static HashCode fromBytesNoCopy(byte[] bytes) {
    return new BytesHashCode(bytes);
  }

    return fromBytesNoCopy(bytes.clone());
  }

  /**
   * Creates a {@code HashCode} from a byte array. The array is <i>not</i> copied defensively, so it
   * must be handed-off so as to preserve the immutability contract of {@code HashCode}.
   */
  static HashCode fromBytesNoCopy(byte[] bytes) {
    return new BytesHashCode(bytes);
  }

      for (int i = 0; i < nextBytes.length; i++) {
        resultBytes[i] = (byte) (resultBytes[i] * 37 ^ nextBytes[i]);
      }
    }
    return HashCode.fromBytesNoCopy(resultBytes);
  }

  /**
   * Returns a hash code, having the same bit length as each of the input hash codes, that combines

      return out.toByteArray();
    }

    void assertBytes(byte[] expected) {
      assertArrayEquals(expected, bytes());
    }

    @Override
    public HashCode hash() {
      return HashCode.fromBytesNoCopy(bytes());
    }
  }

      checkState(!done, "Cannot re-use a Hasher after calling hash() on it");
    }

    @Override
    public HashCode hash() {
      checkNotDone();
      done = true;
      return HashCode.fromBytesNoCopy(mac.doFinal());
    }
  }

      return out.toByteArray();
    }

    void assertBytes(byte[] expected) {
      assertArrayEquals(expected, bytes());
    }

    @Override
    public HashCode hash() {
      return HashCode.fromBytesNoCopy(bytes());
    }
  }