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test: increase coverage of `Module.register` and `initialize` hook · nodejs/node@866d646 · GitHub

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test: increase coverage of Module.register and initialize hook
PR-URL: #49532 Backport-PR-URL: #50669 Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
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‎test/es-module/test-esm-loader-hooks.mjs‎

Lines changed: 157 additions & 89 deletions
Original file line numberDiff line numberDiff line change
@@ -399,28 +399,29 @@ describe('Loader hooks', { concurrency: true }, () => {
399399
assert.strictEqual(signal, null);
400400
});
401401

402-
it('should invoke `initialize` correctly', async () => {
403-
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
404-
'--no-warnings',
405-
'--experimental-loader',
406-
fixtures.fileURL('es-module-loaders/hooks-initialize.mjs'),
407-
'--input-type=module',
408-
'--eval',
409-
'import os from "node:os";',
410-
]);
402+
describe('`initialize`/`register`', () => {
403+
it('should invoke `initialize` correctly', async () => {
404+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
405+
'--no-warnings',
406+
'--experimental-loader',
407+
fixtures.fileURL('es-module-loaders/hooks-initialize.mjs'),
408+
'--input-type=module',
409+
'--eval',
410+
'import os from "node:os";',
411+
]);
411412

412-
assert.strictEqual(stderr, '');
413-
assert.deepStrictEqual(stdout.split('\n'), ['hooks initialize 1', '']);
414-
assert.strictEqual(code, 0);
415-
assert.strictEqual(signal, null);
416-
});
413+
assert.strictEqual(stderr, '');
414+
assert.deepStrictEqual(stdout.split('\n'), ['hooks initialize 1', '']);
415+
assert.strictEqual(code, 0);
416+
assert.strictEqual(signal, null);
417+
});
417418

418-
it('should allow communicating with loader via `register` ports', async () => {
419-
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
420-
'--no-warnings',
421-
'--input-type=module',
422-
'--eval',
423-
`
419+
it('should allow communicating with loader via `register` ports', async () => {
420+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
421+
'--no-warnings',
422+
'--input-type=module',
423+
'--eval',
424+
`
424425
import {MessageChannel} from 'node:worker_threads';
425426
import {register} from 'node:module';
426427
import {once} from 'node:events';
@@ -441,25 +442,25 @@ describe('Loader hooks', { concurrency: true }, () => {
441442
]);
442443
clearTimeout(timeout);
443444
port1.close();
444-
`,
445-
]);
445+
`,
446+
]);
446447

447-
assert.strictEqual(stderr, '');
448-
assert.deepStrictEqual(stdout.split('\n'), [ 'register undefined',
449-
'message initialize',
450-
'message resolve node:os',
451-
'' ]);
448+
assert.strictEqual(stderr, '');
449+
assert.deepStrictEqual(stdout.split('\n'), [ 'register undefined',
450+
'message initialize',
451+
'message resolve node:os',
452+
'' ]);
452453

453-
assert.strictEqual(code, 0);
454-
assert.strictEqual(signal, null);
455-
});
454+
assert.strictEqual(code, 0);
455+
assert.strictEqual(signal, null);
456+
});
456457

457-
it('should have `register` work with cjs', async () => {
458-
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
459-
'--no-warnings',
460-
'--input-type=commonjs',
461-
'--eval',
462-
`
458+
it('should have `register` work with cjs', async () => {
459+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
460+
'--no-warnings',
461+
'--input-type=commonjs',
462+
'--eval',
463+
`
463464
'use strict';
464465
const {register} = require('node:module');
465466
register(
@@ -472,56 +473,54 @@ describe('Loader hooks', { concurrency: true }, () => {
472473
import('node:os').then((result) => {
473474
console.log(JSON.stringify(result));
474475
});
475-
`,
476-
]);
476+
`,
477+
]);
477478

478-
assert.strictEqual(stderr, '');
479-
assert.deepStrictEqual(stdout.split('\n').sort(), ['hooks initialize 1', '{"default":"foo"}', ''].sort());
479+
assert.strictEqual(stderr, '');
480+
assert.deepStrictEqual(stdout.split('\n').sort(), ['hooks initialize 1', '{"default":"foo"}', ''].sort());
480481

481-
assert.strictEqual(code, 0);
482-
assert.strictEqual(signal, null);
483-
});
482+
assert.strictEqual(code, 0);
483+
assert.strictEqual(signal, null);
484+
});
484485

485-
it('`register` should work with `require`', async () => {
486-
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
487-
'--no-warnings',
488-
'--require',
489-
fixtures.path('es-module-loaders/register-loader.cjs'),
490-
'--input-type=module',
491-
'--eval',
492-
'import "node:os";',
493-
]);
486+
it('`register` should work with `require`', async () => {
487+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
488+
'--no-warnings',
489+
'--require',
490+
fixtures.path('es-module-loaders/register-loader.cjs'),
491+
'--input-type=module',
492+
'--eval',
493+
'import "node:os";',
494+
]);
494495

495-
assert.strictEqual(stderr, '');
496-
assert.deepStrictEqual(stdout.split('\n'), ['resolve passthru', 'resolve passthru', '']);
497-
assert.strictEqual(code, 0);
498-
assert.strictEqual(signal, null);
499-
});
496+
assert.strictEqual(stderr, '');
497+
assert.deepStrictEqual(stdout.split('\n'), ['resolve passthru', 'resolve passthru', '']);
498+
assert.strictEqual(code, 0);
499+
assert.strictEqual(signal, null);
500+
});
500501

501-
it('`register` should work with `import`', async () => {
502-
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
503-
'--no-warnings',
504-
'--import',
505-
fixtures.fileURL('es-module-loaders/register-loader.mjs'),
506-
'--input-type=module',
507-
'--eval',
508-
`
509-
import 'node:os';
510-
`,
511-
]);
502+
it('`register` should work with `import`', async () => {
503+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
504+
'--no-warnings',
505+
'--import',
506+
fixtures.fileURL('es-module-loaders/register-loader.mjs'),
507+
'--input-type=module',
508+
'--eval',
509+
'import "node:os"',
510+
]);
512511

513-
assert.strictEqual(stderr, '');
514-
assert.deepStrictEqual(stdout.split('\n'), ['resolve passthru', '']);
515-
assert.strictEqual(code, 0);
516-
assert.strictEqual(signal, null);
517-
});
512+
assert.strictEqual(stderr, '');
513+
assert.deepStrictEqual(stdout.split('\n'), ['resolve passthru', '']);
514+
assert.strictEqual(code, 0);
515+
assert.strictEqual(signal, null);
516+
});
518517

519-
it('should execute `initialize` in sequence', async () => {
520-
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
521-
'--no-warnings',
522-
'--input-type=module',
523-
'--eval',
524-
`
518+
it('should execute `initialize` in sequence', async () => {
519+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
520+
'--no-warnings',
521+
'--input-type=module',
522+
'--eval',
523+
`
525524
import {register} from 'node:module';
526525
console.log('result 1', register(
527526
${JSON.stringify(fixtures.fileURL('es-module-loaders/hooks-initialize.mjs'))}
@@ -531,16 +530,85 @@ describe('Loader hooks', { concurrency: true }, () => {
531530
));
532531
533532
await import('node:os');
534-
`,
535-
]);
533+
`,
534+
]);
536535

537-
assert.strictEqual(stderr, '');
538-
assert.deepStrictEqual(stdout.split('\n'), [ 'hooks initialize 1',
539-
'result 1 undefined',
540-
'hooks initialize 2',
541-
'result 2 undefined',
542-
'' ]);
543-
assert.strictEqual(code, 0);
544-
assert.strictEqual(signal, null);
536+
assert.strictEqual(stderr, '');
537+
assert.deepStrictEqual(stdout.split('\n'), [ 'hooks initialize 1',
538+
'result 1 undefined',
539+
'hooks initialize 2',
540+
'result 2 undefined',
541+
'' ]);
542+
assert.strictEqual(code, 0);
543+
assert.strictEqual(signal, null);
544+
});
545+
546+
it('should handle `initialize` returning never-settling promise', async () => {
547+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
548+
'--no-warnings',
549+
'--input-type=module',
550+
'--eval',
551+
`
552+
import {register} from 'node:module';
553+
register('data:text/javascript,export function initialize(){return new Promise(()=>{})}');
554+
`,
555+
]);
556+
557+
assert.strictEqual(stderr, '');
558+
assert.strictEqual(stdout, '');
559+
assert.strictEqual(code, 13);
560+
assert.strictEqual(signal, null);
561+
});
562+
563+
it('should handle `initialize` returning rejecting promise', async () => {
564+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
565+
'--no-warnings',
566+
'--input-type=module',
567+
'--eval',
568+
`
569+
import {register} from 'node:module';
570+
register('data:text/javascript,export function initialize(){return Promise.reject()}');
571+
`,
572+
]);
573+
574+
assert.match(stderr, /undefined\r?\n/);
575+
assert.strictEqual(stdout, '');
576+
assert.strictEqual(code, 1);
577+
assert.strictEqual(signal, null);
578+
});
579+
580+
it('should handle `initialize` throwing null', async () => {
581+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
582+
'--no-warnings',
583+
'--input-type=module',
584+
'--eval',
585+
`
586+
import {register} from 'node:module';
587+
register('data:text/javascript,export function initialize(){throw null}');
588+
`,
589+
]);
590+
591+
assert.match(stderr, /null\r?\n/);
592+
assert.strictEqual(stdout, '');
593+
assert.strictEqual(code, 1);
594+
assert.strictEqual(signal, null);
595+
});
596+
597+
it('should be fine to call `process.exit` from a initialize hook', async () => {
598+
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
599+
'--no-warnings',
600+
'--input-type=module',
601+
'--eval',
602+
`
603+
import {register} from 'node:module';
604+
register('data:text/javascript,export function initialize(){process.exit(42);}');
605+
`,
606+
]);
607+
608+
assert.strictEqual(stderr, '');
609+
assert.strictEqual(stdout, '');
610+
assert.strictEqual(code, 42);
611+
assert.strictEqual(signal, null);
612+
});
545613
});
546614
});

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