Ensure that error-in-post test is run

[trivikr]

The test error-in-post was added in commit 01f1039, but it was never run as file didn't end with .test.js. Also, it isn't called from other test files.
This code change changes file extension to .test.js so that it's run

The output of npm run test before the code change:

...
test/delete.test.js ................................. 43/43
test/fastify-instance.test.js ......................... 1/1
...

after the code change:

...
test/delete.test.js ................................. 43/43
test/error-in-post.test.js ............................ 2/2
test/fastify-instance.test.js ......................... 1/1
...

Checklist

• run npm run test and npm run benchmark
• commit message and code follows Code of conduct

[mcollina]

LGTM

[mcollina]

I'm not sure why that test fails on Windows.

Can you try adding a t.plan(1) and remove the 'beforeExit check?

[trivikr]

Added t.plan(1) and removed beforeExit check as per #1096 (comment)

[mcollina]

Thanks!!

[github-actions]

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