for (RoundingMode roundingMode : EnumSet.complementOf(EnumSet.of(UNNECESSARY))) {
      for (long candidate : roundToDoubleTestCandidates) {
        assertThat(LongMath.roundToDouble(candidate, roundingMode))
            .isEqualTo(BigIntegerMath.roundToDouble(BigInteger.valueOf(candidate), roundingMode));
      }
    }
  }

  @GwtIncompatible
  public void testRoundToDoubleAgainstBigIntegerUnnecessary() {

   *     is not precisely representable as a {@code double}
   * @since 30.0
   */
  @GwtIncompatible
  public static double roundToDouble(BigInteger x, RoundingMode mode) {
    return BigIntegerToDoubleRounder.INSTANCE.roundToDouble(x, mode);
  }

  @GwtIncompatible
  private static class BigIntegerToDoubleRounder extends ToDoubleRounder<BigInteger> {

   *     is not precisely representable as a {@code double}
   * @since 30.0
   */
  @SuppressWarnings("deprecation")
  @GwtIncompatible
  public static double roundToDouble(long x, RoundingMode mode) {
    // Logic adapted from ToDoubleRounder.
    double roundArbitrarily = (double) x;
    long roundArbitrarilyAsLong = (long) roundArbitrarily;
    int cmpXToRoundArbitrarily;

   *     is not precisely representable as a {@code double}
   * @since 30.0
   */
  @SuppressWarnings("deprecation")
  @GwtIncompatible
  public static double roundToDouble(long x, RoundingMode mode) {
    // Logic adapted from ToDoubleRounder.
    double roundArbitrarily = (double) x;
    long roundArbitrarilyAsLong = (long) roundArbitrarily;
    int cmpXToRoundArbitrarily;