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[Issue #57] Fix flaky NATSEventBus integration tests #58

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HugoNijhuis merged 1 commits from issue-57 into main 2026-01-10 23:11:48 +00:00
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HugoNijhuis commented 2026-01-10 23:09:54 +00:00
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Summary

Fixed three flaky integration tests in the NATSEventBus module that were intermittently failing on CI runners. The tests now use subscriber readiness synchronization barriers and extended timeouts appropriate for CI environments.

Changes

  • TestNATSEventBus_HighThroughput: Added barrier event for subscriber readiness synchronization before bulk event publishing. Extended timeout from 30s to 60s.
  • TestNATSEventBus_EventOrdering: Added barrier event for readiness before publishing ordered events. Extended timeout from 10s to 15s.
  • TestNATSEventBus_ConcurrentPublishSubscribe: Added barrier event before concurrent publishers start. Extended timeout from 10s to 30s.

Technical Details

The root causes were:

  • Subscriber channels not fully ready when rapid event publishing began, causing message loss
  • CI runners (ARM64) have different timing characteristics than local machines
  • Insufficient timeouts for high-volume event collection under shared CI resources

The fix uses a barrier pattern: publish a ready signal, wait to receive it, then proceed. This is more reliable than fixed sleep durations and ensures the NATS subscription is fully established before bulk operations.

Closes #57

## Summary Fixed three flaky integration tests in the NATSEventBus module that were intermittently failing on CI runners. The tests now use subscriber readiness synchronization barriers and extended timeouts appropriate for CI environments. ## Changes - **TestNATSEventBus_HighThroughput**: Added barrier event for subscriber readiness synchronization before bulk event publishing. Extended timeout from 30s to 60s. - **TestNATSEventBus_EventOrdering**: Added barrier event for readiness before publishing ordered events. Extended timeout from 10s to 15s. - **TestNATSEventBus_ConcurrentPublishSubscribe**: Added barrier event before concurrent publishers start. Extended timeout from 10s to 30s. ## Technical Details The root causes were: - Subscriber channels not fully ready when rapid event publishing began, causing message loss - CI runners (ARM64) have different timing characteristics than local machines - Insufficient timeouts for high-volume event collection under shared CI resources The fix uses a barrier pattern: publish a ready signal, wait to receive it, then proceed. This is more reliable than fixed sleep durations and ensures the NATS subscription is fully established before bulk operations. Closes #57
HugoNijhuis added 1 commit 2026-01-10 23:09:54 +00:00
Fix flaky NATSEventBus integration tests
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18ea677585 
The integration tests had timing issues causing intermittent failures on CI:

- TestNATSEventBus_HighThroughput: Added subscriber readiness synchronization using a barrier event before bulk publishing. This ensures the NATS subscription is fully established before events are sent rapidly. Extended timeout from 30s to 60s for CI environments.

- TestNATSEventBus_EventOrdering: Added readiness barrier event to synchronize subscriber setup before publishing ordered events. Extended timeout from 10s to 15s to account for CI timing variations.

- TestNATSEventBus_ConcurrentPublishSubscribe: Added readiness synchronization before concurrent publishers start. Extended timeout from 10s to 30s to handle the increased load under CI constraints.

Root causes:
- Subscriber channels were not fully ready to receive when bulk publishing started, causing message loss
- CI runners (especially ARM64) have different timing characteristics than local development
- Insufficient timeouts for high-volume event collection under shared CI resources

The fixes use a barrier pattern: publish a ready signal, wait to receive it, then proceed with the test. This is more reliable than fixed sleep durations.

Closes #57

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
HugoNijhuis commented 2026-01-10 23:11:42 +00:00
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AI Code Review

This is an automated review generated by the code-reviewer agent.

Summary

Addresses flaky integration tests by replacing fixed sleep with barrier synchronization pattern and extending CI timeouts. Sound approach that directly addresses root cause.

Findings

Code Quality: Excellent barrier pattern implementation. Clear comments explain synchronization logic. Consistent pattern across all three tests.

Potential Bugs: No issues found. Barrier pattern correctly implemented with appropriate timeout handling. Ready events are properly consumed without affecting test counts.

Security Concerns: No security concerns identified.

Style Notes: Consistent with codebase conventions. Good timeout choices (5s barrier, extended collection timeouts).

Test Coverage: Tests remain meaningful and address acceptance criteria without hiding issues.

Potential Improvements (Non-blocking)

Consider extracting the repeated barrier synchronization into a test helper function to reduce duplication.

Verdict

LGTM - Ready to merge. Changes use proper synchronization primitive instead of just increasing timeouts.

## AI Code Review This is an automated review generated by the code-reviewer agent. ### Summary Addresses flaky integration tests by replacing fixed sleep with barrier synchronization pattern and extending CI timeouts. Sound approach that directly addresses root cause. ### Findings **Code Quality**: Excellent barrier pattern implementation. Clear comments explain synchronization logic. Consistent pattern across all three tests. **Potential Bugs**: No issues found. Barrier pattern correctly implemented with appropriate timeout handling. Ready events are properly consumed without affecting test counts. **Security Concerns**: No security concerns identified. **Style Notes**: Consistent with codebase conventions. Good timeout choices (5s barrier, extended collection timeouts). **Test Coverage**: Tests remain meaningful and address acceptance criteria without hiding issues. ### Potential Improvements (Non-blocking) Consider extracting the repeated barrier synchronization into a test helper function to reduce duplication. ### Verdict **LGTM** - Ready to merge. Changes use proper synchronization primitive instead of just increasing timeouts.
HugoNijhuis merged commit 18ea677585 into main 2026-01-10 23:11:48 +00:00
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Reference: flowmade-one/aether#58
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