How to test front-end pages

This time I will bring you the method of front-end page testing. What are the precautions for front-end page testing? The following is a practical case, let’s take a look.

Regarding function testing, for example, if there are some fixed input and output, you can use mocha to test

Regarding the testing of page functions, nightmare is recommended.

var Nightmare = require('nightmare');var nightmare = Nightmare({ show: true });
nightmare
  .goto('https://www.taobao.com/')  //待测试链接
  .type('#q', '电视机')   //输入框选中，输入值
  .click('form[action*="/search"] [type=submit]')//form表单提交
  .wait(3000)
  .exists('#spulist-grid')
  .evaluate(function () {    return document.querySelector('#spulist-grid .grid-item .info-cont') //获取需返回的值
      .textContent.trim();
  })
  .end()
  .then(function (result) {  //即为return中的数据
    console.log(result);
  })
  .catch(function (error) {  //错误捕捉
    console.error('Search failed:', error);
  });

Can be used in combination with mocha.

var Nightmare = require('nightmare');var expect = require('chai').expect;var fork = require('child_process').fork;
describe('test index.html', function() {  var child;
  before(function (done) {   //钩子函数，测试之前调用
    child = fork('./server.js');
    child.on('message', function (msg) {      if (msg === 'listening') {
        done();
      }
    });
  });
  after(function () { //钩子函数，测试之后调用
    child.kill();
  });
  it('点击后标题改变', function (done) {    var nightmare = Nightmare({ show: true });
    nightmare
      .goto('http://127.0.0.1:8080/index.html')
      .click('h1')
      .wait(1000)
      .evaluate(function () {        return document.querySelector('h1').style.color;
      })
      .end()
      .then(function(color) {        console.log(color)
        expect(color).to.equal('red');
        done();
      })
  });
});

I don’t know why, but I always feel that front-end automated testing is quite difficult to some extent. Ask the master to popularize it...

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to the php Chinese website Other related articles!

Recommended reading:

Detailed explanation of call in javascript

##What are the differences between call, apply and bind in javascript

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