.putUnencodedChars("c")
                .hash(),
            hashFunction.newHasher().putChar('a').putUnencodedChars("bc").hash(),
            hashFunction.newHasher().putUnencodedChars("ab").putChar('c').hash(),
            hashFunction.newHasher().putChar('a').putChar('b').putChar('c').hash())
        .testEquals();

    int size = random.nextInt(2048);
    byte[] bytes = new byte[size];

    public Hasher putLong(long l) {
      ensureCapacity(Long.BYTES);
      buffer.putLong(l);
      return this;
    }

    @Override
    public Hasher putChar(char c) {
      ensureCapacity(Character.BYTES);
      buffer.putChar(c);
      return this;
    }

    @Override
    public HashCode hash() {
      return hashBytes(buffer.array(), 0, buffer.position());
    }
  }

    ByteBuffer scratch = scratch();
    scratch.putLong(l);
    return update(scratch, Longs.BYTES);
  }

  @Override
  @CanIgnoreReturnValue
  public Hasher putChar(char c) {
    ByteBuffer scratch = scratch();
    scratch.putChar(c);
    return update(scratch, Chars.BYTES);
  }

  private ByteBuffer scratch() {
    if (scratch == null) {

                .putUnencodedChars("c")
                .hash(),
            hashFunction.newHasher().putChar('a').putUnencodedChars("bc").hash(),
            hashFunction.newHasher().putUnencodedChars("ab").putChar('c').hash(),
            hashFunction.newHasher().putChar('a').putChar('b').putChar('c').hash())
        .testEquals();

    int size = random.nextInt(2048);
    byte[] bytes = new byte[size];

    HashCode unused = sink.hash();
    sink.assertInvariants(8);
    sink.assertBytes(new byte[] {1, 2, 3, 4, 5, 6, 7, 8});
  }

  public void testChar() {
    Sink sink = new Sink(4);
    sink.putChar((char) 0x0201);
    HashCode unused = sink.hash();
    sink.assertInvariants(2);
    sink.assertBytes(new byte[] {1, 2, 0, 0}); // padded with zeros
  }

  public void testString() {
    Random random = new Random();

    byte[] buffer = MANY_VALUES_PAIRED_STATS.toByteArray();
    byte[] tooLongByteArray =
        ByteBuffer.allocate(buffer.length + 2)
            .order(ByteOrder.LITTLE_ENDIAN)
            .put(buffer)
            .putChar('.')
            .array();
    assertThrows(IllegalArgumentException.class, () -> PairedStats.fromByteArray(tooLongByteArray));
  }

  public void testFromByteArrayWithTooShortArrayInputThrowsIllegalArgumentException() {

    byte[] buffer = MANY_VALUES_PAIRED_STATS.toByteArray();
    byte[] tooLongByteArray =
        ByteBuffer.allocate(buffer.length + 2)
            .order(ByteOrder.LITTLE_ENDIAN)
            .put(buffer)
            .putChar('.')
            .array();
    assertThrows(IllegalArgumentException.class, () -> PairedStats.fromByteArray(tooLongByteArray));
  }

  public void testFromByteArrayWithTooShortArrayInputThrowsIllegalArgumentException() {

        result);
    return (int) result;
  }

  /**
   * Returns a big-endian representation of {@code value} in a 2-element byte array; equivalent to
   * {@code ByteBuffer.allocate(2).putChar(value).array()}. For example, the input value {@code
   * '\\u5432'} would yield the byte array {@code {0x54, 0x32}}.
   *
   * <p>If you need to convert and concatenate several values (possibly even of different types),

        result);
    return (int) result;
  }

  /**
   * Returns a big-endian representation of {@code value} in a 2-element byte array; equivalent to
   * {@code ByteBuffer.allocate(2).putChar(value).array()}. For example, the input value {@code
   * '\\u5432'} would yield the byte array {@code {0x54, 0x32}}.
   *
   * <p>If you need to convert and concatenate several values (possibly even of different types),