Add more test to fix utcOffset DST

[NamPNQ]

No description provided.

[aloisklink]

Hi! Thanks for adding the test to my PR.

Unfortunately, tests are failing. I think you added tests to the wrong file, it should be test/plugin/timezone.test.js. You also need to add the const PARIS = 'Europe/Paris' line.

Dayjs also wants semantic commits, so should name your commit something like:

test: Check if valueOf() is correct across DST

Failing test results:

me@me: ~/dayjs$ npm test
dayjs@0.0.0-development test /home/user/dayjs
...
 FAIL  test/timezone.test.js
  ✓ Add Time days (DST) (9ms)
  ✓ Utc Offset
  ✓ Diff (DST) (6ms)
  ✓ UTC add day in DST (1ms)
  ✓ UTC and utcOffset (2ms)
  ✕ DST valueOf (11ms)
  ✓ UTC diff in DST

  ● DST valueOf

    ReferenceError: PARIS is not defined

      76 | it('DST valueOf', () => {
      77 |   const day1 = '2021-11-17T09:45:00.000Z'
    > 78 |   const d1 = dayjs.utc(day1).tz(PARIS)
      79 |   const m1 = moment.tz(day1, PARIS)
      80 |   expect(d1.valueOf()).toBe(m1.valueOf())
      81 |
      
      at Object.<anonymous> (test/timezone.test.js:78:33)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 6 passed, 7 total
Snapshots:   0 total
Time:        1.63s

[NamPNQ]

Thank you, I have updated my PR

[aloisklink]

Awesome! Thanks for making the changes 👍