assertMean(0, 0, 0);
    assertMean(-1, -1, -1);
    assertMean(Long.MIN_VALUE, Long.MIN_VALUE, Long.MIN_VALUE);
    assertMean(Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE);

    // Exhaustive checks
    for (long x : ALL_LONG_CANDIDATES) {
      for (long y : ALL_LONG_CANDIDATES) {
        assertMean(x, y);
      }
    }
  }

  /** Helper method that asserts the arithmetic mean of x and y is equal to the expectedMean. */

   * value).hashCode()}.
   *
   * <p>This method always return the value specified by {@link Long#hashCode()} in java, which
   * might be different from {@code ((Long) value).hashCode()} in GWT because {@link
   * Long#hashCode()} in GWT does not obey the JRE contract.
   *
   * <p><b>Java 8+ users:</b> use {@link Long#hashCode(long)} instead.
   *
   * @param value a primitive {@code long} value

   * 0} and {@code 2^64 - 1} inclusive.
   *
   * <p><b>Java 8+ users:</b> use {@link Long#compareUnsigned(long, long)} instead.
   *
   * @param a the first unsigned {@code long} to compare
   * @param b the second unsigned {@code long} to compare
   * @return a negative value if {@code a} is less than {@code b}; a positive value if {@code a} is

    // slightly nearer.
    long floatConversionTest = 0xfffffe8000000002L;
    long doubleConversionTest = 0xfffffffffffff402L;

    for (long i = -3; i <= 3; i++) {
      testLongsBuilder
          .add(i)
          .add(Long.MAX_VALUE + i)
          .add(Long.MIN_VALUE + i)
          .add(Integer.MIN_VALUE + i)
          .add(Integer.MAX_VALUE + i)

   */
  public long sum() {
    long sum = 0L;
    for (AtomicLong value : map.values()) {
      sum = sum + value.get();
    }
    return sum;
  }

  @LazyInit @CheckForNull private transient Map<K, Long> asMap;

  /** Returns a live, read-only view of the map backing this {@code AtomicLongMap}. */
  public Map<K, Long> asMap() {
    Map<K, Long> result = asMap;

  @GwtIncompatible // #roundIntermediate
  public static long roundToLong(double x, RoundingMode mode) {
    double z = roundIntermediate(x, mode);
    checkInRangeForRoundingInputs(
        MIN_LONG_AS_DOUBLE - z < 1.0 & z < MAX_LONG_AS_DOUBLE_PLUS_ONE, x, mode);
    return (long) z;
  }

  private static final double MIN_LONG_AS_DOUBLE = -0x1p63;
  /*

        .isNull();
    assertWithMessage("Max long").that(Ints.tryParse(Long.toString(Long.MAX_VALUE))).isNull();
    assertWithMessage("Min long").that(Ints.tryParse(Long.toString(Long.MIN_VALUE))).isNull();
    assertThat(Ints.tryParse("\u0662\u06f3")).isNull();
  }

  /**
   * Applies {@link Ints#tryParse(String)} to the given string and asserts that the result is as
   * expected.

    for (byte value : VALUES) {
      assertThat(SignedBytes.checkedCast((long) value)).isEqualTo(value);
    }
    assertCastFails(GREATEST + 1L);
    assertCastFails(LEAST - 1L);
    assertCastFails(Long.MAX_VALUE);
    assertCastFails(Long.MIN_VALUE);
  }

  public void testSaturatedCast() {
    for (byte value : VALUES) {
      assertThat(SignedBytes.saturatedCast((long) value)).isEqualTo(value);
    }

  }

  private void setSuccessor(int entry, int succ) {
    long succMask = (~0L) >>> 32;
    setLink(entry, (link(entry) & ~succMask) | ((succ + 1) & succMask));
  }

  private void setPredecessor(int entry, int pred) {
    long predMask = ~0L << 32;
    setLink(entry, (link(entry) & ~predMask) | ((long) (pred + 1) << 32));
  }

  private void setSucceeds(int pred, int succ) {

      implements Supplier<T>, Serializable {
    final Supplier<T> delegate;
    final long durationNanos;
    @CheckForNull transient volatile T value;
    // The special value 0 means "not yet initialized".
    transient volatile long expirationNanos;

    ExpiringMemoizingSupplier(Supplier<T> delegate, long durationNanos) {
      this.delegate = delegate;
      this.durationNanos = durationNanos;
    }