any showcase for node:test concurrency options?

[atian25]

Details

as https://nodejs.org/dist/latest-v18.x/docs/api/test.html#testname-options-fn docs says, subtests could run concurrency.

when try as:

test('multi level test', { concurrency: 2 }, async (t) => {
  await t.test('subtest 1', async () => {
    console.log('1');
    await setTimeout(2000);
    console.log('11');
  });

  await t.test('subtest 2', async () => {
    console.log('2');
    await setTimeout(1000);
    console.log('22');
  });
});

itdon't work, since each subtests is awaited.

---

but if write test like below:

test('multi level test', { concurrency: 2 }, async (t) => {
  t.test('subtest 1', async () => {
    console.log('1');
    await setTimeout(2000);
    console.log('11');
  });

  t.test('subtest 2', async () => {
    console.log('2');
    await setTimeout(1000);
    console.log('22');
  });
});

got error:

not ok 1 - subtest 1
      ---
      duration_ms: 0.001728458
      failureType: 'cancelledByParent'
      error: "'test did not finish before its parent and was cancelled'"
      code: ERR_TEST_FAILURE
      ...

Node.js version

18.0.0

Example code

No response

Operating system

macOS

Scope

test

Module and version

Not applicable.

[atian25]

@targos

[MoLow]

Hi.
concurrency can be used with Promise.all:

test('multi level test', { concurrency: 2 }, async (t) => {
	await Promise.all([
		t.test('subtest 1', async () => {
	      console.log('1');
	      await setTimeout(2000);
	      console.log('11');
	    });
	  
	    t.test('subtest 2', async () => {
	      console.log('2');
	      await setTimeout(1000);
	      console.log('22');
	    });
	]);
});

or with describe:

descrie('multi level test', { concurrency: 2 }, async () => {
	it('subtest 1', async () => {
      console.log('1');
      await setTimeout(2000);
      console.log('11');
    });
  
    it('subtest 2', async () => {
      console.log('2');
      await setTimeout(1000);
      console.log('22');
    });
});

[bitliner]

I cannot get it work, with the following code:

const test = require('node:test')
const assert = require('node:assert/strict')

const wait = (ms) => new Promise((resolve) => setTimeout(() => resolve(), ms))

const input = [{
  expected: 2,
  actual: 2
}, {
  expected: 'ola',
  actual: 'ciao'
}]

input.forEach((el, index) => {
  test('should work', { concurrency: true }, async (t) => {
    console.log(`start-${index}`)
    await wait(3000)

    assert.strictEqual(el.actual, el.expected)
    console.log(`end-${index}`)
  })
})

node version: v20.9.0

I'm running it with

const { junit } = require('node:test/reporters')
const { run } = require('node:test')
const path = require('node:path')

run({ concurrency: true, files: [path.resolve(__dirname, './test-suite-1.js')] })
  .compose(junit)
  .pipe(process.stdout)

[atian25]

Hi. concurrency can be used with Promise.all:

test('multi level test', { concurrency: 2 }, async (t) => {
	await Promise.all([
		t.test('subtest 1', async () => {
	      console.log('1');
	      await setTimeout(2000);
	      console.log('11');
	    });
	  
	    t.test('subtest 2', async () => {
	      console.log('2');
	      await setTimeout(1000);
	      console.log('22');
	    });
	]);
});

or with describe:

descrie('multi level test', { concurrency: 2 }, async () => {
	it('subtest 1', async () => {
      console.log('1');
      await setTimeout(2000);
      console.log('11');
    });
  
    it('subtest 2', async () => {
      console.log('2');
      await setTimeout(1000);
      console.log('22');
    });
});

with the first showcase, { concurrency: 2 } seems to be useless due to it can't affect Promise.all()

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