jest.config.js

module.exports = {
    roots: [
        './src'
    ],
    moduleFileExtensions: [
        "js",
        "json",
        // tell Jest to handle `*.vue` files
        "vue"
    ],
    transform: {
        // process `*.vue` files with `vue-jest`
        ".*\\.(vue)$": "vue-jest",
        "^.+\\.js$": "./node_modules/babel-jest"
    },
    collectCoverage: true,
    collectCoverageFrom: ["**/*.{js,vue}", "!**/node_modules/**"]
};