assertEquals(expected.toBigInteger(), DoubleMath.roundToBigInteger(d, UNNECESSARY));
    }
  }

  @GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
  public void testRoundExactFractionalDoubleToBigIntegerFails() {
    for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
      try {
        DoubleMath.roundToBigInteger(d, UNNECESSARY);
        fail("Expected ArithmeticException");

      assertEquals(expected.toBigInteger(), DoubleMath.roundToBigInteger(d, UNNECESSARY));
    }
  }

  @GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
  public void testRoundExactFractionalDoubleToBigIntegerFails() {
    for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
      try {
        DoubleMath.roundToBigInteger(d, UNNECESSARY);
        fail("Expected ArithmeticException");

      tmp += DoubleMath.roundToLong(doubleInLongRange[j], mode);
    }
    return tmp;
  }

  @Benchmark
  int roundToBigInteger(int reps) {
    int tmp = 0;
    for (int i = 0; i < reps; i++) {
      int j = i & ARRAY_MASK;
      tmp += DoubleMath.roundToBigInteger(positiveDoubles[j], mode).intValue();
    }
    return tmp;
  }

  @Benchmark
  int log2Round(int reps) {
    int tmp = 0;

      tmp += DoubleMath.roundToLong(doubleInLongRange[j], mode);
    }
    return tmp;
  }

  @Benchmark
  int roundToBigInteger(int reps) {
    int tmp = 0;
    for (int i = 0; i < reps; i++) {
      int j = i & ARRAY_MASK;
      tmp += DoubleMath.roundToBigInteger(positiveDoubles[j], mode).intValue();
    }
    return tmp;
  }

  @Benchmark
  int log2Round(int reps) {
    int tmp = 0;

    BigInteger maxDoubleAsBI = DoubleMath.roundToBigInteger(Double.MAX_VALUE, UNNECESSARY);
    new RoundToDoubleTester(maxDoubleAsBI).setExpectation(Double.MAX_VALUE, values()).test();
  }

  @J2ktIncompatible
  @GwtIncompatible
  public void testRoundToDouble_maxDoublePlusOne() {
    BigInteger maxDoubleAsBI =
        DoubleMath.roundToBigInteger(Double.MAX_VALUE, UNNECESSARY).add(BigInteger.ONE);

    BigInteger maxDoubleAsBI = DoubleMath.roundToBigInteger(Double.MAX_VALUE, UNNECESSARY);
    new RoundToDoubleTester(maxDoubleAsBI).setExpectation(Double.MAX_VALUE, values()).test();
  }

  @J2ktIncompatible
  @GwtIncompatible
  public void testRoundToDouble_maxDoublePlusOne() {
    BigInteger maxDoubleAsBI =
        DoubleMath.roundToBigInteger(Double.MAX_VALUE, UNNECESSARY).add(BigInteger.ONE);

    } while (sqrt1.compareTo(sqrt0) < 0);
    return sqrt0;
  }

  @GwtIncompatible // TODO
  private static BigInteger sqrtApproxWithDoubles(BigInteger x) {
    return DoubleMath.roundToBigInteger(Math.sqrt(DoubleUtils.bigToDouble(x)), HALF_EVEN);
  }

  /**
   * Returns {@code x}, rounded to a {@code double} with the specified rounding mode. If {@code x}

   *           RoundingMode#UNNECESSARY}
   *     </ul>
   */
  // #roundIntermediate, java.lang.Math.getExponent, com.google.common.math.DoubleUtils
  @GwtIncompatible
  public static BigInteger roundToBigInteger(double x, RoundingMode mode) {
    x = roundIntermediate(x, mode);
    if (MIN_LONG_AS_DOUBLE - x < 1.0 & x < MAX_LONG_AS_DOUBLE_PLUS_ONE) {
      return BigInteger.valueOf((long) x);
    }