JSTests/test262/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/argument-plaindate-calendar-same-object.js

// Copyright (C) 2022 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-temporal.plaindatetime.prototype.withplaindate
description: PlainDate calendar is preserved when both calendars are the same object
features: [Temporal]
includes: [temporalHelpers.js]
---*/

let calls = 0;
const cal = {
  id: 'thisisnotiso',
  toString() {
    ++calls;
    return "this is a string";
  },
  year() { return 2008; },
  month() { return 9; },
  monthCode() { return "M09"; },
  day() { return 6; }
};
const pdt = new Temporal.PlainDateTime(1995, 12, 7, 3, 24, 30, 0, 0, 0, cal);
const pd = new Temporal.PlainDate(2010, 11, 12, cal);
const shifted = pdt.withPlainDate(pd);

TemporalHelpers.assertPlainDateTime(
  shifted,
  2008, 9, "M09", 6, 3, 24, 30, 0, 0, 0,
  "calendar is unchanged with same calendars (1)"
  // Testing of era and eraYear should only be coded under intl402
);

assert.sameValue(
  shifted.calendar,
  cal,
  "calendar is unchanged with same calendars (2)"
);
assert.sameValue(calls, 0, "should not have called cal.toString()");