jest/e2e/__tests__/unexpectedToken.test.ts

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import {tmpdir} from 'os';
import * as path from 'path';
import {cleanup, writeFiles} from '../Utils';
import runJest from '../runJest';

const DIR = path.resolve(tmpdir(), 'unexpected-token');

beforeEach(() => cleanup(DIR));
afterEach(() => cleanup(DIR));

test('triggers unexpected token error message for non-JS assets', () => {
  writeFiles(DIR, {
    '.watchmanconfig': '{}',
    'asset.css': '.style {}',
    'package.json': JSON.stringify({jest: {testEnvironment: 'node'}}),
  });

  writeFiles(DIR, {
    '__tests__/asset.test.js':
      "require('../asset.css'); test('asset', () => {});",
  });

  const {stdout, stderr} = runJest(DIR, ['']);

  expect(stdout).toBe('');
  expect(stderr).toMatch(/Jest encountered an unexpected token/);
  expect(stderr).toMatch(/.style {}/);
  expect(stderr).toMatch(/Unexpected token ./);
});

test('triggers ERR_REQUIRE_ESM for untranspiled node_modules with ESM syntax', () => {
  writeFiles(DIR, {
    '.watchmanconfig': '{}',
    'node_modules/untranspiled-module': 'import {module} from "some-module"',
    'package.json': JSON.stringify({jest: {testEnvironment: 'node'}}),
  });

  writeFiles(DIR, {
    '__tests__/untranspiledModule.test.js':
      "require('untranspiled-module'); test('untranspiled', () => {});",
  });

  const {stdout, stderr} = runJest(DIR, ['']);

  expect(stdout).toBe('');
  expect(stderr).toMatch(
    /Must use import to load ES Module.*untranspiled-module/,
  );
});

test('does not trigger unexpected token error message for regular syntax errors', () => {
  writeFiles(DIR, {
    '.watchmanconfig': '{}',
    'faulty.js': 'import {module from "some-module"',
    'faulty2.js': 'const name = {first: "Name" second: "Second"}',
    'package.json': JSON.stringify({jest: {testEnvironment: 'node'}}),
  });

  writeFiles(DIR, {
    '__tests__/faulty.test.js':
      "require('../faulty'); test('faulty', () => {});",
    '__tests__/faulty2.test.js':
      "require('../faulty2'); test('faulty2', () => {});",
  });

  const {stdout, stderr} = runJest(DIR, ['']);

  expect(stdout).toBe('');
  expect(stderr).not.toMatch(/Jest encountered an unexpected token/);
});