assertEquals(BigIntegerMath.sqrt(x, floorWasOdd ? HALF_UP : HALF_DOWN), halfEven);
    }
  }

  @GwtIncompatible // TODO
  @AndroidIncompatible // slow
  public void testDivNonZero() {
    for (BigInteger p : NONZERO_BIGINTEGER_CANDIDATES) {
      for (BigInteger q : NONZERO_BIGINTEGER_CANDIDATES) {
        for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
          BigInteger expected =

      }
    }
  }

  @AndroidIncompatible // slow
  @GwtIncompatible // Math.floorDiv gets wrong answers for negative divisors
  public void testDivNonZero() {
    for (int p : NONZERO_INTEGER_CANDIDATES) {
      for (int q : NONZERO_INTEGER_CANDIDATES) {
        for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {