unaryarith-date-valueOf.js

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load(libdir + "asserts.js");

function test(date) {

  let inc = date;

  let dec = date;

  return [+date, -date, ~date, ++inc, --dec];

with ({}) {}

let date = new Date("2000-01-01");

let val = 946684800000;

let expected = [val, -val, ~val, val+1, val-1]

for (var i = 0; i < 2000; i++) {

  if (i == 1750) {

    Object.defineProperty(Date.prototype, "valueOf", {value: () => 3});

    expected = [3, -3, ~3, 4, 2];

  let result = test(date);

  assertDeepEq(result, expected);