Question

131

Mock using jest moment().format is returning current date instead of mocked date

rated 0 times [ 135] [ 4] / answers: 1 / hits: 7286 / 5 Years ago, tue, august 27, 2019, 12:00:00

I am trying to mock moment library's format function using jest. I have following code in my test file.

app.spec.js:

jest.mock('moment', () => {

    const moment = () => ({

        format: () => mockedTime

    });

    moment.tz = {

        setDefault: () => {}

    };

    moment.tz.setDefault('Asia/Singapore');

    return moment;

});

app.js:

moment.tz.setDefault(TIMEZONE);

moment().format('YYYYMMDD');

it is generating following output:

 - date: 20190825, // mocked date

 - date: 20190827, // result value

the expected output should be:

 - date: 20190825, // mocked date

 - date: 20190825, // result value

Can anyone help me point out what's wrong with the code?

Thanks.

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micayla

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answered 5 Years ago walker · Accepted Answer

Mocking 'moment-timezone' instead of 'moment fixed it.

jest.mock('moment-timezone', () => {

    const moment = () => ({

        format: () => mockedTime

    });

    moment.tz = {

        setDefault: () => {}

    };

    moment.tz.setDefault('Asia/Singapore');

    return moment;

});