tests: serialize conflictive runtime tests (perf improvement)

[edsiper]

This change improves unit-test wall-clock time in CI by allowing the runtime suite to run safely in parallel under ctest -j, while explicitly serializing only the known conflicting cases.

What changed:

• Added CTest RESOURCE_LOCK handling in tests/runtime/CMakeLists.txt:300
• Serialized only the runtime executables that bind the same fixed ports:
  • flb-rt-core_internal_logger and flb-rt-filter_wasm on 2020
  • flb-rt-in_opentelemetry and flb-rt-in_opentelemetry_routing on 4318
  • flb-rt-in_tcp and flb-rt-out_tcp on 5170
• No CI workflow changes were required because GitHub Actions already invokes ctest -j $nparallel

Measured impact:

• Sequential internal+runtime suite: about 2321.23s (38m 41s)
• Parallel internal+runtime suite with locks: about 299.53s (4m 59s)
• Reduction: about 87.1% wall-clock time

---

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

Release Notes

• Tests
  • Improved reliability of runtime tests by preventing concurrent execution conflicts on shared resources.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f930636b-bf36-47fc-8d19-0318ab4d81e4

📥 Commits

Reviewing files that changed from the base of the PR and between 405fed0 and d950b04.

📒 Files selected for processing (1)

• tests/runtime/CMakeLists.txt

---

📝 Walkthrough

Walkthrough

A new CMake function flb_runtime_lock_tests() is introduced to add RESOURCE_LOCK properties to runtime tests, enabling test-level serialization to prevent concurrent execution of port-dependent tests that would contend on the same resource.

Changes

Cohort / File(s)	Summary
Test Serialization Configuration tests/runtime/CMakeLists.txt	Added flb_runtime_lock_tests(resource_name) function that iterates over test names and applies RESOURCE_LOCK properties to serialize execution of tests sharing the same resource.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~6 minutes

Poem

🐰 A rabbit hops through CMake lines,
With locks and tests aligned,
No more shall ports collide or race,
Each test finds its rightful place! 🔒

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: introducing test serialization for conflicting runtime tests to improve CI performance.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch unit-tests-parallel

📝 Coding Plan for PR comments

• Generate coding plan

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[cosmo0920]

A big 👍!
I was struggled with handling this resource competed test cases.