coverage testing blocked by promise should report where that promise came from

[Pomax]

Version

24.8.0

Platform

macos sequioa

Subsystem

test runner

What steps will reproduce the bug?

create any dir and put a test.js file in it with content:

import test, { describe } from "node:test";
import assert from "node:assert/strict";

describe(`project testing`, async () => {
  test(`this'll hang`, async () => {
    const value = await new Promise((resolve) => {
      console.log(`looks like this'll never resolve()`);
    });
    assert.equal(value, true);
  });
});

Then run this with node --test "test.js"

Obviously this'll never finish, so hit ctrl-c, which triggers the final report and shows:

^C✖ test.js (1376.646ms)
ℹ tests 1
ℹ suites 0
ℹ pass 0
ℹ fail 0
ℹ cancelled 1
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 1379.56475

✖ failing tests:

test at test.js:1:1
✖ test.js (1376.646ms)
  'Promise resolution is still pending but the event loop has already resolved'

And, sure: that's true... but this message also isn't information, because it tells us nothing that lets us fix the problem.

Which promise is still pending? Which file, line, and column and the promise invocation be found on? Because Node knows where promise call sites are, and it should include that information in the error report.

How often does it reproduce? Is there a required condition?

This is how things work right now.

What is the expected behavior? Why is that the expected behavior?

The error should be:

test at test.js:6:18
✖ test.js (1598.681125ms)
  'Promise resolution is still pending but the event loop has already resolved'

explicitly showing the line things went wrong on.

And if there is a promise pending because of some dependency of a dependency, it should show that entire trace: if test.js is awaiting getInfo() imported from ./utils.js and that calls getNetworkDeviceNames() imported from ./utils/network.js and that has a promise that never resolves, then this error should let folks find that problem:

test at test.js:6:18
  at utils.js:20:14
  at utils/network.js:112:25
✖ test.js (1598.681125ms)
  'Promise resolution is still pending but the event loop has already resolved'

Or however traces should be made to look for this functionality. The important part is that it's informative so that we can fix bugs. After all, that's the whole point of using node --test =)