test: update versioned test helper to handle [email protected] changes

[jmartin4563]

Proposed Release Notes

• update versioned test helper to handle [email protected] changes

Links

• https://github.com/vercel/next.js/blob/canary/packages/next/src/server/lib/start-server.ts#L192
• Consolidate Server and Routing process into one process vercel/next.js#53523

Details

Next.js 13.4.15 changed their startServer functionality to no longer return the server. Our versioned tests helpers were using that return value to shutdown the server in between runs. This change detects the new version and creates a simple shim that uses an event emitter to trigger next's internal cleanup functionality.

[codecov]

Codecov Report

Merging #153 (6745f51) into main (7ec3d76) will decrease coverage by 9.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
- Coverage   92.69%   83.46%   -9.24%     
==========================================
  Files           4        4              
  Lines         260      260              
==========================================
- Hits          241      217      -24     
- Misses         19       43      +24     

Flag	Coverage Δ
unit-tests-16.x	47.69% <ø> (ø)
unit-tests-18.x	47.69% <ø> (ø)
unit-tests-20.x	47.69% <ø> (ø)
versioned-tests-16.x	81.15% <ø> (-11.54%)	⬇️
versioned-tests-18.x	81.15% <ø> (-11.54%)	⬇️
versioned-tests-20.x	81.15% <ø> (-11.54%)	⬇️

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see 1 file with indirect coverage changes

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