Jest + material-uiでのエラー解消

概要

materiral-uiのテストで必要な設定があったので備忘録

エラー内容

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:
 • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
 • 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:

node_modules/@material-ui/core/esm/Typography/index.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){export { default } from './Typography';

対応

エラーに書いてある通りなのだけど・・・transformIgnorePatternsの設定が必要だった。
こんな感じで設定

// jest.config.js
module.exports = {
  ︙,
  transformIgnorePatterns: [
    'node_modules/(?!@material-ui)/',
  ]
}