}
  }

  public void testCeilingPowerOfTwoZero() {
    assertThrows(
        IllegalArgumentException.class, () -> BigIntegerMath.ceilingPowerOfTwo(BigInteger.ZERO));
  }

  public void testFloorPowerOfTwoZero() {
    assertThrows(
        IllegalArgumentException.class, () -> BigIntegerMath.floorPowerOfTwo(BigInteger.ZERO));
  }

  @GwtIncompatible // TODO
  public void testConstantSqrt2PrecomputedBits() {