kk-date/test/weekStartDay.test.js

kk-date is a fastest JavaScript library that parses, validations, manipulates, and displays dates and times. If you use Moment.js or Day.js already you can easily use kk-date.

const { describe, test, expect } = require('@jest/globals');
const kk_date = require('../index');

describe('weekStartDay tests for startOf and endOf', () => {
	test('should return Sunday as startOf and Saturday as endOf when weekStartDay is 0', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 0 });
		expect(date.startOf('weeks').format('dddd')).toBe('Sunday');
		expect(date.endOf('weeks').format('dddd')).toBe('Saturday');
	});

	test('should return Monday as startOf and Sunday as endOf when weekStartDay is 1', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 1 });
		expect(date.startOf('weeks').format('dddd')).toBe('Monday');
		expect(date.endOf('weeks').format('dddd')).toBe('Sunday');
	});

	test('should return Tuesday as startOf and Monday as endOf when weekStartDay is 2', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 2 });
		expect(date.startOf('weeks').format('dddd')).toBe('Tuesday');
		expect(date.endOf('weeks').format('dddd')).toBe('Monday');
	});

	test('should return Wednesday as startOf and Tuesday as endOf when weekStartDay is 3', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 3 });
		expect(date.startOf('weeks').format('dddd')).toBe('Wednesday');
		expect(date.endOf('weeks').format('dddd')).toBe('Tuesday');
	});

	test('should return Thursday as startOf and Wednesday as endOf when weekStartDay is 4', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 4 });
		expect(date.startOf('weeks').format('dddd')).toBe('Thursday');
		expect(date.endOf('weeks').format('dddd')).toBe('Wednesday');
	});

	test('should return Friday as startOf and Thursday as endOf when weekStartDay is 5', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 5 });
		expect(date.startOf('weeks').format('dddd')).toBe('Friday');
		expect(date.endOf('weeks').format('dddd')).toBe('Thursday');
	});

	test('should return Saturday as startOf and Friday as endOf when weekStartDay is 6', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 6 });
		expect(date.startOf('weeks').format('dddd')).toBe('Saturday');
		expect(date.endOf('weeks').format('dddd')).toBe('Friday');
	});

	test('should return Sunday as startOf and Saturday as endOf when weekStartDay is a string', () => {
		const date = new kk_date();
		date.config({ weekStartDay: 'test' });
		expect(date.startOf('weeks').format('dddd')).toBe('Sunday');
		expect(date.endOf('weeks').format('dddd')).toBe('Saturday');
	});

	test('should default to Sunday as startOf and Saturday as endOf when weekStartDay is not provided', () => {
		const date = new kk_date();
		date.config({});
		expect(date.startOf('weeks').format('dddd')).toBe('Sunday');
		expect(date.endOf('weeks').format('dddd')).toBe('Saturday');
	});
	test('should throw an error when weekStartDay', () => {
		expect(() => new kk_date().config({ weekStartDay: 8 })).toThrow();
	});
	test('Should be six days weekStartDay when 0-1 is entered, the difference between the start and end ', () => {
		kk_date.config({ weekStartDay: 0 });
		const kkdate1 = new kk_date();
		expect(new kk_date(kkdate1.startOf('weeks')).diff(new kk_date(kkdate1.endOf('weeks')), 'days')).toBe(6);

		kk_date.config({ weekStartDay: 2 });
		const kkdate2 = new kk_date();
		expect(new kk_date(kkdate2.startOf('weeks')).diff(new kk_date(kkdate2.endOf('weeks')), 'days')).toBe(6);
	});

	test('Should be six days weekStartDay when random 0-6 is entered, the difference between the start and end ', () => {
		kk_date.config({ weekStartDay: Math.floor(Math.random() * 7) });
		const kkdate1 = new kk_date();
		expect(new kk_date(kkdate1.startOf('weeks')).diff(new kk_date(kkdate1.endOf('weeks')), 'days')).toBe(6);
	});
});