This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". Here's what you can do: • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns"in your config. • If you need a custom transformation specify a "transform" option in your config. • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.
You'll find more details and examples of these config options in the docs: https://jestjs.io/docs/en/configuration.html Details: D:\GIT 소스코드 저장소\TDD\JEST\vue-jest\vue-jest-start\src\test\helloworld.test.js:1 ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import { mount } from '@vue/test-utils';
1. 해당 라이브러리가 정상적으로 설치 되어 있는지 확인한다.
1) jest 2) vue-jest 3) @babel/core 4) @babel/preset-env 5) babel-jest 6) @vue/test-utils 7) babel-core@^7.0.0-bridge.0 (바벨이 7.0 이상 사용중일때)