text: const time = require('./time').default;
  
  describe('timeUtils', function() {
  
  	beforeEach(async (done) => {
  		done();
  	});
  
  	it('should go back in time', (async () => {
  		let startDate = new Date('3 Aug 2020');
  		let endDate = new Date('2 Aug 2020');
  
  		expect(time.goBackInTime(startDate, 1, 'day')).toBe(endDate.getTime().toString());
  
  		// We're always subtracting time from the beginning of the current period.
  		startDate = new Date('3 Aug 2020 07:30:20');
  		expect(time.goBackInTime(startDate, 1, 'day')).toBe(endDate.getTime().toString());
  
  		// Note: this test randomly fails - https://github.com/laurent22/joplin/issues/3722
  
  		// startDate = new Date('11 Aug 2020');
  		// endDate = new Date('9 Aug 2020'); // week start;
  		// expect(time.goBackInTime(startDate, 0, 'week')).toBe(endDate.getTime().toString());
  
  		startDate = new Date('02 Feb 2020');
  		endDate = new Date('01 Jan 2020');
  		expect(time.goBackInTime(startDate, 1, 'month')).toBe(endDate.getTime().toString());
  
  		startDate = new Date('19 September 2020');
  		endDate = new Date('01 Jan 1997');
  		expect(time.goBackInTime(startDate, 23, 'year')).toBe(endDate.getTime().toString());
  	}));
  
  	it('should go forward in time', (async () => {
  		let startDate = new Date('2 Aug 2020');
  		let endDate = new Date('3 Aug 2020');
  
  		expect(time.goForwardInTime(startDate, 1, 'day')).toBe(endDate.getTime().toString());
  
  		startDate = new Date('2 Aug 2020 07:30:20');
  		expect(time.goForwardInTime(startDate, 1, 'day')).toBe(endDate.getTime().toString());
  
  
  		// startDate = new Date('9 Aug 2020');
  		// endDate = new Date('9 Aug 2020'); // week start;
  		// expect(time.goForwardInTime(startDate, 0, 'week')).toBe(endDate.getTime().toString());
  
  		startDate = new Date('02 Jan 2020');
  		endDate = new Date('01 Feb 2020');
  		expect(time.goForwardInTime(startDate, 1, 'month')).toBe(endDate.getTime().toString());
  
  		startDate = new Date('19 September 1997');
  		endDate = new Date('01 Jan 2020');
  		expect(time.goForwardInTime(startDate, 23, 'year')).toBe(endDate.getTime().toString());
  	}));
  
  });
  