If you already have a project created with Nuxt but without Jest configured, I'll show you how to do it.

💡 My Nuxt.js version is 2.14.12.

Steps

1. Install dependencies
   

   npm i -D @vue/test-utils babel-core@^7.0.0-bridge.0 babel-jest jest vue-jest
   

2. Add command test in package.json.
   

   {
     //...
     "scripts": {
       //...
       "test": "jest"
     }
     //...
   }
   

3. Add file jest.config.js in root directory
   

   module.exports = {
     moduleNameMapper: {
       '^@/(.*)$': '<rootDir>/$1',
       '^~/(.*)$': '<rootDir>/$1',
       '^vue$': 'vue/dist/vue.common.js',
     },
     moduleFileExtensions: ['js', 'vue', 'json'],
     transform: {
       '^.+\\.js$': 'babel-jest',
       '.*\\.(vue)$': 'vue-jest',
     },
     collectCoverage: true,
     collectCoverageFrom: [
       '<rootDir>/components/**/*.vue',
       '<rootDir>/pages/**/*.vue',
     ],
   }
   

4. Add file .babelrc in root directory
   

   {
     "env": {
       "test": {
         "presets": [
           [
             "@babel/preset-env",
             {
               "targets": {
                 "node": "current"
               }
             }
           ]
         ]
       }
     }
   }
   

5. Create test directory in root directory
   

   mkdir test
   

6. Write your first test of your component /test/YourComponent.spec.js
   

   import { mount } from '@vue/test-utils'
   import YourComponent from '@/components/YourComponent'
   
   describe('YourComponent', () => {
     test('is a Vue instance', () => {
       const wrapper = mount(YourComponent)
       expect(wrapper.vm).toBeTruthy()
     })
   })
   

💡 I recommend you to read:

• Vue Testing (optional)
• Vue Test Utils (important)

Thank you for readme! see you soon 😉