import 'jest-preset-angular/setup-jest'; import { fakeAsync } from '@angular/core/testing'; Object.defineProperty(window, 'CSS', { value: null }); Object.defineProperty(window, 'getComputedStyle', { value: () => { return { display: 'none', appearance: ['-webkit-appearance'] }; } }); Object.defineProperty(document, 'doctype', { value: '' }); Object.defineProperty(document.body.style, 'transform', { value: () => { return { enumerable: true, configurable: true }; } });