config to control handling for tests that 'Failed to exit' - v6+ issue about ava HOT 3 CLOSED

This was discussed here: #3260 (comment)

But I'll use this as the tracking issue.

I run integration tests with a local database and want to keep the database pool open.

Since each test file runs in its own isolated worker thread, I don't think this will make a difference.

In 5.3.1, this worked fine but it breaks after upgrading and no other changes on my end.

Yes this was a change in AVA 6. It's listed under the Breaking Changes in the release notes:

When tests finish, worker threads or child processes are no longer exited through proces.exit(). If your test file does not exit on its own, the test run will time out.

Please enable some kind of way to set up the configuration to forcibly exit and pass if all tests ran & passed

See suggestion at #3260 (comment):

I think a import { registerCompleteHandler } from 'ava' which sets up a function to be called when AVA is done would be a decent solution. You could then registerCompleteHandler(() => process.exit()) and AVA will just assume the test worker exited on its own. This could be in a helper file that is loaded.

Other use cases are as a cleanup routine that sits outside of AVA's test & hook logic. I'm leaning to a solution like this over configuration because configuration implies we can handle edge cases in Node.js and we can't.

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@croconut let me know if #3283 works for you.

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@novemberborn thanks a bunch, I'll give this a shot

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