I'm having trouble getting my Nuxt app to work with Jest for testing. I have a setupFilesAfterEnv property set with a setupTests.ts file that imports a translation file. The translations file uses ES6 import/export module syntax, but it seems like my current configuration isn't transpiling it properly.
Shouldn't babel-jest be transpiling the .js files due to the transform property?
setupTests.ts
import { config } from '@vue/test-utils';
import flat from 'flat';
import '@testing-library/jest-dom/extend-expect';
import 'jest-axe/extend-expect';
import frenchTranslations from '~/config/translations/fr-FR';
...
babel.config.json
{
"presets": ["@babel/preset-env", { "targets": { "node": "current" } }]
}
jest.config.js
module.exports = {
moduleNameMapper: {
'^@/(.*)$': '<rootDir>/$1',
'^~/(.*)$': '<rootDir>/$1',
'^vue$': 'vue/dist/vue.common.js',
},
moduleFileExtensions: ['ts', 'js', 'vue', 'json'],
resolver: '<rootDir>/test/integration/resolver.js',
transform: {
'^.+\\.ts$': 'ts-jest',
'^.+\\.js$': 'babel-jest',
'^.+\\.vue$': '@vue/vue2-jest',
},
collectCoverage: true,
collectCoverageFrom: [
'<rootDir>/components/**/*.vue',
'<rootDir>/pages/**/*.vue',
],
testEnvironment: 'jsdom',
passWithNoTests: true,
setupFilesAfterEnv: ['<rootDir>/test/integration/setupTests.ts'],
};
/config/translations/fr-FR.js
export default {
...
}
Jest output
FAIL test/integration/components/ui/RegistrationForm.test.ts
● Test suite failed to run
Jest encountered an unexpected token
Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.
Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.
By default "node_modules" folder is ignored by transformers.
Here's what you can do:
• If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
• If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
• 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/configuration
For information about custom transformations, see:
https://jestjs.io/docs/code-transformation
Details:
/my-project/config/translations/fr-FR.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){export default {
^^^^^^
SyntaxError: Unexpected token 'export'
1 | import { config } from '@vue/test-utils';
2 | import flat from 'flat';
3 | import '@testing-library/jest-dom/extend-expect';
4 | import 'jest-axe/extend-expect';
> 5 | import frenchTranslations from '~/config/translations/fr-FR';
at Runtime.createScriptFromCode (node_modules/.pnpm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1f757a6c6b326d6a716b76727a5f2d27312e313a">[email protected]</a>/node_modules/jest-runtime/build/index.js:1796:14)
at Object.<anonymous> (test/integration/setupTests.ts:5:1)
at TestScheduler.scheduleTests (node_modules/.pnpm/@<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="94fef1e7e0bff7fbe6f1d4a6acbaa5baafaa">[email protected]</a>/node_modules/@jest/core/build/TestScheduler.js:317:13)
----------------------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------------------|---------|----------|---------|---------|-------------------
All files | 0 | 0 | 0 | 0 |
RegistrationForm.vue | 0 | 0 | 0 | 0 | 1-113
----------------------
Test Suites: 1 failed, 1 total
Tests: 0 total
Snapshots: 0 total
Time: 1.35 s
Ran all test suites related to changed files.