assertEquals(BigIntegerMath.log10(x, floorWasEven ? HALF_DOWN : HALF_UP), halfEven);
    }
  }

  @GwtIncompatible // TODO
  public void testLog10TrivialOnPowerOf10() {
    BigInteger x = BigInteger.TEN.pow(100);
    for (RoundingMode mode : ALL_ROUNDING_MODES) {
      assertEquals(100, BigIntegerMath.log10(x, mode));
    }
  }

  @GwtIncompatible // TODO