/
resolveBrowserField.test.ts
71 lines (63 loc) · 2.18 KB
/
resolveBrowserField.test.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* 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 {wrap} from 'jest-snapshot-serializer-raw';
import {cleanup, writeFiles, writeSymlinks} from '../Utils';
import runJest from '../runJest';
const DIR = path.resolve(tmpdir(), 'resolve-browser-field-test');
beforeEach(() => cleanup(DIR));
afterAll(() => cleanup(DIR));
test('preserves module identity for symlinks when using browser field resolution', () => {
/* eslint-disable sort-keys */
writeFiles(DIR, {
'packages/needs-preserved-id/index.js': `
console.log("needs-preserved-id executed");
module.exports = {};
`,
'packages/needs-preserved-id/package.json': JSON.stringify({
name: 'needs-preserved-id',
}),
'packages/has-browser-field/package.json': JSON.stringify({
name: 'has-browser-field',
browser: 'browser.js',
}),
'packages/has-browser-field/browser.js': `
module.exports = require("needs-preserved-id");
`,
'package.json': JSON.stringify({
jest: {
testMatch: ['<rootDir>/test-files/test.js'],
browser: true,
},
}),
'test-files/test.js': `
const id1 = require("needs-preserved-id");
const id2 = require("has-browser-field");
test("module should have reference equality", () => {
expect(id1).toBe(id2);
});
`,
});
/* eslint-enable */
writeSymlinks(DIR, {
'packages/has-browser-field': 'node_modules/has-browser-field',
'packages/needs-preserved-id': 'node_modules/needs-preserved-id',
});
writeSymlinks(DIR, {
'packages/needs-preserved-id':
'packages/has-browser-field/node_modules/needs-preserved-id',
});
const {stdout, stderr, exitCode} = runJest(DIR, ['--no-watchman']);
expect(stderr).toContain('Test Suites: 1 passed, 1 total');
expect(wrap(stdout.trim())).toMatchInlineSnapshot(`
console.log
needs-preserved-id executed
at Object.<anonymous> (packages/needs-preserved-id/index.js:1:13)
`);
expect(exitCode).toEqual(0);
});