/**

* @jest-environment jsdom

*/

import { WP } from '../src/constants';

import { isPerformanceSupported } from '../src/isSupported';

import mock from './_mock';

describe('isSupported', () => {

beforeEach(() => {

(WP as any) = mock.performance();

(window as any).PerformanceObserver = mock.PerformanceObserver;

});

describe('.isPerformanceSupported()', () => {

it('should return true if the browser supports the Navigation Timing API', () => {

expect(isPerformanceSupported()).toEqual(true);

});

it('should return false if the browser does not supports performance.mark', () => {

// @ts-ignore

delete window.performance.mark;

expect(isPerformanceSupported()).toEqual(false);

});

it('should return false if the browser does not supports performance.now', () => {

// @ts-ignore

window.performance.mark = () => 1;

// @ts-ignore

delete window.performance.now;

expect(isPerformanceSupported()).toEqual(false);

});

});

});