This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

jest로 test하는 와중에 아래와 같은 에러 발생

  ● Test suite failed to run

    Jest encountered an unexpected token

    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:

    SyntaxError: /Users/void/-/src/app.ts: Unexpected token (4:11) 

 

jest.config.js 파일에 

  preset: 'ts-jest',

를 추가하니 에러 해결

 

참고 : https://github.com/kulshekhar/ts-jest/issues/937