node:test beforeEach and afterEach generate MaxListenersExceededWarning #48475
Description
Version
v20.3.0
Platform
No response
Subsystem
node:test
What steps will reproduce the bug?
import {beforeEach, test} from "node:test"
beforeEach(() => {})
for (let i=1; i<=11; ++i) test(`${i}`, () => {})Run tests with node --test
How often does it reproduce? Is there a required condition?
Consistently with 11 or more tests that share a beforeEach or afterEach hook. This does not occur if each test has its own after hook, e.g.: test(`${i}`, (t) => t.after(() => {}))
What is the expected behavior? Why is that the expected behavior?
No warning should be emitted when running the tests. It is reasonable to have more than 10 unit tests that share a beforeEach and/or afterEach hook, and explicitly using events.setMaxListeners() in the unit tests should not be necessary to avoid the warning.
What do you see instead?
$ node --trace-warnings --test
(node:11354) MaxListenersExceededWarning: Possible EventTarget memory leak detected. 11 abort listeners added to [AbortSignal]. Use events.setMaxListeners() to increase limit
at [kNewListener] (node:internal/event_target:539:17)
at [kNewListener] (node:internal/abort_controller:235:24)
at EventTarget.addEventListener (node:internal/event_target:650:23)
at eventTargetAgnosticAddListener (node:events:1024:13)
at node:events:981:5
at new Promise (<anonymous>)
at once (node:events:964:10)
at stopTest (node:internal/test_runner/test:78:12)
at TestHook.run (node:internal/test_runner/test:547:27)
at TestHook.run (node:internal/test_runner/test:748:18)Additional information
No response