Vue CLI has built-in options for unit testing with Jest or Mocha that works out of the box. Component (read-only): This is the Vue instance. You can access all the instance methods and properties of a vm with wrapper.vm. In a regular Vue app, we install Vuex using Vue.use(Vuex), and then pass a new Vuex store to the app. Learn about the Wrapper object in a FREE video lesson from Vue School # Properties # vm. The vue-jest preprocessor supports basic SFC functionalities, but currently does not handle style blocks or custom blocks, which are only supported in vue-loader. foo).

import {mount } from '@vue/test-utils' import Foo from './Foo.vue' const wrapper = mount (Foo) wrapper. The component will receive an even prop, that is a boolean. # setProps. Read the following guides for different setups: Vue Test Utils is a wrapper based API.

If false , it should render 1, 3, 5, 7 and 9. setProps ({foo: 'bar'}) expect (wrapper. Simple Assertions. Utilities for testing Vue components. Using Jest to unit test Vue.js components can be tricky.

Vue Test Utils is the official unit testing utility library for Vue.js. We need a separate Vue Test Utils (@vue/test-utils) scoped package in order to virtually mount our components and use Jest to …

Introduction.

We can use the same performant approach to test any component prop. # Wrapper.

When we test standard prop validation, it's enough to assert that the prop object is configured correctly. Arguments: {Object} props; Usage: Sets Wrapper vm props and forces update. If you rely on these features or other webpack-specific configurations, you will need to use a webpack + vue-loader based setup. @AluanHaddad the code you see export default Vue.extend({}) is a scaffolding generated by nuxt, when you choose javacript, it's just export default {} when you choose typescript at installation, it is automatically generated export default Vue.extend({}) – Yung Silva May 26 at 19:08 You don’t have to do anything special in your components to make them testable. Testing standard prop validation in Vue.js. Note the Wrapper must contain a Vue instance. vm.

A Wrapper is an object that contains a mounted component or vnode and methods to test the component or vnode. If we do the same in a unit test, though, all unit tests will receive the Vuex store - even tests that are not using the store. There you go, a simple, reliable way of testing your custom prop validators in Vue.js! We also have the official Vue Test Utils which provides more detailed guidance for custom setups. If even is true , the component should render 2, 4, 6, and 8.