.setExpectation(Math.nextUp(twoToThe54), CEILING, UP)
        .roundUnnecessaryShouldThrow()
        .test();
  }

  public void testRoundToDouble_twoToThe54PlusThree() {
    double twoToThe54 = Math.pow(2, 54);
    // the representable doubles are 2^54 and 2^54 + 4
    // 2^54+3 is more than halfway between, so HALF_DOWN and HALF_UP will both go up.