Getting Started with Vue Test Utils – onlinecode

Getting Started with Vue Test Utils – onlinecode

In this post, we will give you information about Getting Started with Vue Test Utils – onlinecode. Here we will give you detail about Getting Started with Vue Test Utils – onlinecode And how to use it also give you a demo for it if it is necessary.

Vue Test Utils is Vue’s official library for testing Vue components
from Node.js. For example, suppose you have a simple counter component:

const Vue = require('vue');

module.exports = Vue.component('App', {
  data: () => ({ count: 0 }),
  methods: {
    increment: function increment() {
      ++this.count;
    }
  },
  template: '
    <div>
      <span>{{count}}</span>
      <button @click="increment">Increment</button>
    </div>
  '
});

Here’s how you can mount and interact with the above component using Vue Test Utils. Note that Vue Test Utils requires JSDom to work. The below example is a standalone script
that you can run in Node.js, no test runners required.

// Make sure to put jsdom before 'require('vue')'!
require('jsdom-global')();

const Vue = require('vue');
const { mount } = require('@vue/test-utils');

// Must be a component, **not** a Vue instance, otherwise you get:
// "Failed to mount component: template or render function not defined"
const component = Vue.component('App', {
  data: () => ({ count: 0 }),
  methods: {
    increment: function increment() {
      ++this.count;
    }
  },
  template: '
    <div>
      <span>{{count}}</span>
      <button @click="increment">Increment</button>
    </div>
  '
});

const wrapper = mount(component);

run().catch(err => console.log(err));

async function run() {
  wrapper.html(); // <div><span>0</span> <button>Increment</button></div>

  // Note that 'trigger()' is an async function
  await wrapper.find('button').trigger('click');
  wrapper.html(); // <div><span>1</span> <button>Increment</button></div>
}

Testing with Mocha

Mocha is a minimal test framework, so you can easily port the above script into Mocha tests. Plus, Mocha makes it
easy to clean up JSDom when your tests are done, so you don’t have to worry about polluting your Node.js environment
if you want to run Node tests.

const assert = require('assert');

describe('App', function() {
  let Vue;
  let mount;
  let cleanup;
  let wrapper;

  before(async function() {
    cleanup = require('jsdom-global')();
    Vue = require('vue');
    mount = require('@vue/test-utils').mount;
  });

  after(() => cleanup());

  beforeEach(function() {
    const component = Vue.component('App', {
      data: () => ({ count: 0 }),
      methods: {
        increment: function increment() {
          ++this.count;
        }
      },
      template: '
        <div>
          <span>{{count}}</span>
          <button @click="increment">Increment</button>
        </div>
      '
    });
    wrapper = mount(component);
  });

  it('increments when you click', async function() {
    assert.ok(wrapper.html().includes('<span>0</span'));

    await wrapper.find('button').trigger('click');
    assert.ok(wrapper.html().includes('<span>1</span'));
  });
});

Vue.js is a progressive JavaScript framework that makes building user interfaces simple and enjoyable. Vue is designed from the ground up to be incrementally adoptable, so you can use the features you need, and mix and match Vue with other libraries or frameworks.

Vue is a relatively new framework, but it has quickly become one of the most popular JavaScript frameworks in the world. It is used by large companies like Alibaba, Baidu, and Xiaomi, as well as by thousands of smaller businesses and startups.

Here are some of the features that make Vue.js so popular:

  • Declarative rendering: Vue uses a declarative rendering model, which means that you can describe the desired output of your application in terms of HTML, CSS, and JavaScript. This makes it easy to reason about your code and to make changes to your application.
  • Reactivity: Vue is a reactive framework, which means that it automatically updates the DOM whenever there is a change to the application’s state. This makes your application feel fast and responsive.
  • Composition: Vue is a component-based framework, which means that you can build your application out of reusable components. This makes your code more maintainable and easier to test.
  • Performance: Vue is a highly performant framework. It has been benchmarked against other popular JavaScript frameworks, and it has consistently outperformed them.

If you are looking for a JavaScript framework that is easy to learn, powerful, and performant, then Vue.js is a great choice.

Here are some of the things you can do with Vue.js:

  • Build single-page applications
  • Create user interfaces for web, mobile, and desktop applications
  • Integrate with other JavaScript frameworks and libraries
  • Build custom components
  • Create reusable code
  • Test your code

If you are interested in learning more about Vue.js, there are a number of resources available online. The official Vue.js website has a comprehensive documentation and a number of tutorials. There are also a number of third-party websites and blogs that offer tutorials, articles, and other resources about Vue.js.

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