tl;dr version of getting Vue unit testing starting on a Laravel app.

NPM

1. npm install –save-dev @vue/test-utils mocha mochapack
2. npm install –save-dev jsdom jsdom-global
3. npm install –save-dev expect

Configuration (opininated)

1. Add tests/Vue/setup.js
2. Add tests/Vue/components/
3. Add test scripts to package.json

setup.js

require('jsdom-global')()
global.expect = require('expect')

package.json

"test": "mochapack --webpack-config node_modules/laravel-mix/setup/webpack.config.js --require tests/Vue/setup.js tests/Vue/component