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[英]navigator.serviceWorker when multiple service workers are regisered
[英]Setting up JSDOM navigator.serviceWorker for unit testing service workers
我正在尋找一種設置navigator.serviceWorker的方法來對我的服務人員進行單元測試。 我當前的JSDOM設置如下所示:
import { JSDOM } from 'jsdom';
const dom = new JSDOM('<!DOCTYPE html><html><head></head><body></body></html>');
global.window = dom.window;
global.document = dom.window.document;
Object.keys(global.window).forEach(property => {
if (typeof global[property] === 'undefined') {
global[property] = global.window[property];
}
});
global.navigator = {
userAgent: 'node.js'
};
我已經嘗試將global.navigator = ...
注釋為global.navigator = global.window.navigator
。 但是,以下console.log(global.navigator.serviceWorker)
和console.log(navigator.serviceWorker)
在我的單元測試中均返回undefined
:
describe('Service Worker', () => {
it('should register a service worker and cache files on install', () => {
console.log(navigator.serviceWorker); // undefined
// navigator.serviceWorker.register() // not used yet since undefined
});
});
使用Object.defineProperty
方法創建一個新的serviceWorker
屬性:
Object.defineProperty(global.navigator, 'serviceWorker', {
value: {
register: jest.fn() // Choose your favourite mocking library
}
});
將register
方法定義為模擬函數,將使您可以監視對該函數的調用,還可以返回可以解決或拒絕的承諾。
import sw from './service-worker';
describe('Service worker registration', () => {
it('call navigator.serviceWorker.register with the right URL', () => {
expect(navigator.serviceWorker.register).toHaveBeenCalledWith('/service-worker.js');
});
});
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