test: wait for FFI background optimization

[trivikr]

Refs: https://github.com/nodejs/reliability/issues?q=sort%3Aupdated-desc%20%22test-ffi-fast-integer-validation%22

The pointer range test creates multiple closures from the same function literals and explicitly requests synchronous optimization. V8 can also schedule concurrent recompilation for those closures.

Wait for background optimization before closing the dynamic library so compiler jobs cannot outlive the fast FFI metadata they reference.

---

Assisted-by: codex:gpt-5.6-sol

[nodejs-github-bot]

Review requested:

• @nodejs/ffi

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75856/

[github-actions]

Fast-track has been requested by @trivikr. Please 👍 to approve.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.33%. Comparing base (4551732) to head (46e3f30).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65300      +/-   ##
==========================================
+ Coverage   90.30%   90.33%   +0.02%     
==========================================
  Files         751      751              
  Lines      250235   250235              
  Branches    47305    47303       -2     
==========================================
+ Hits       225987   226044      +57     
+ Misses      15619    15566      -53     
+ Partials     8629     8625       -4     

see 38 files with indirect coverage changes

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[trivikr]

Removed request-ci as it was run manually in #65300 (comment)

[gurgunday]

lgtm

[trivikr]

For some reason, the stress test is not detecting the test file for PR.

In main

+ /home/iojs/venv/bin/python3.12 tools/test.py -p tap --logfile test1.tap --mode=release ffi/test-ffi-fast-integer-validation
TAP version 13
1..1
ok 1 ffi/test-ffi-fast-integer-validation
  ---
  duration_ms: 413.13500
  ...
All tests passed.

https://ci.nodejs.org/job/node-stress-single-test/828

For PR

+ /home/iojs/venv/bin/python3.12 tools/test.py -p tap --logfile test1.tap --mode=release ‎ffi/test-ffi-fast-integer-validation
No tests to run.
+ NOK=1
+ echo '1   OK: 0   NOT OK: 1   TOTAL: 1000'
1   OK: 0   NOT OK: 1   TOTAL: 1000
+ tap2junit -i test1.tap -o test1.xml
Traceback (most recent call last):
  File "/home/iojs/venv/bin/tap2junit", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/iojs/venv/lib/python3.12/site-packages/tap2junit/__main__.py", line 94, in main
    convert(
  File "/home/iojs/venv/lib/python3.12/site-packages/tap2junit/__main__.py", line 68, in convert
    result = parse(name or input_file, data, package)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/iojs/venv/lib/python3.12/site-packages/tap2junit/__main__.py", line 58, in parse
    tap_parser.parse(data)
  File "/home/iojs/venv/lib/python3.12/site-packages/tap2junit/tap13.py", line 237, in parse
    self._parse(io.StringIO(source))
  File "/home/iojs/venv/lib/python3.12/site-packages/tap2junit/tap13.py", line 107, in _parse
    match = RE_VERSION.match(non_empty_lines[0])
                             ~~~~~~~~~~~~~~~^^^
IndexError: list index out of range
+ true

https://ci.nodejs.org/job/node-stress-single-test/829

I've confirmed by running the test locally though

100 runs at -j8.

• 5 crashes in main
• 0 crashes in PR

[nodejs-github-bot]

Landed in c55fa12