Mocha Mocking Js实例函数

Question

Using Mocha, Jsdom, enzyme and Expect assertions. 使用Mocha，Jsdom，酶和Expect断言。

canPlayType always returns an empty string because I am not running the tests in a browser. 因为我不在浏览器中运行测试，所以canPlayType始终返回一个空字符串。 What's the best way to handle this? 处理此问题的最佳方法是什么？ Do I mock it and if so how would I mock it? 我会嘲笑吗？如果是，我会怎么嘲笑呢？

spec file: 规格文件：

it('should be able to play media',() => {
    expect(canPlayMedia()).toBe(true);
});

js file: js文件：

const canPlayMedia = () => {
    const mediaElement = document.createElement('audio');
    // canPlayType is always empty string
    const canPlay = mediaElement.canPlayType('audio/mpeg');

    return canPlay;
}

jsdom file: jsdom文件：

// setup the simplest document possible
const doc = jsdom.jsdom('<!doctype html><html><body></body></html>');

// get the window object out of the document
const win = doc.defaultView;

// set globals for mocha that make access to document and window feel
// natural in the test environment
global.document = doc;
global.window = win;

// from mocha-jsdom https://github.com/rstacruz/mocha-jsdom/blob/master/index.js#L80
const propagateToGlobal = (window) => {
  Object.keys(window).forEach((key) => {
    if (Object.prototype.hasOwnProperty.call(window, key) && !(key in global)) {
      global[key] = window[key];
    }
  });
};

global.document.webkitExitFullscreen = () => null;

// take all properties of the window object and also attach it to the
// mocha global object
propagateToGlobal(win);

Answer 1

it('should be able to play audio',() => {
    const audio = document.createElement('audio');

    expect.spyOn(document, 'createElement').andReturn(audio);
    expect.spyOn(audio, 'canPlayType').andReturn(true);

    expect(canPlayMedia()).toBe(true);

    document.createElement.restore();
});

Mocha Mocking Js实例函数

问题描述

1 个解决方案

解决方案1
0 已采纳 2017-01-30 14:35:05

Mocha Mocking Js实例函数

问题描述

1 个解决方案

解决方案1 0 已采纳 2017-01-30 14:35:05

解决方案1
0 已采纳 2017-01-30 14:35:05