ci: Reduce unit tests concurrency from 2 to 1 #1693
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Our tests are unstable and flaky when running with pytest numprocesses > 1, especially on Windows and macOS. This change reduces concurrency to 1 to determine if the instability is caused by parallel execution or if there are underlying issues in the code/tests. If we want higher concurrency in the future, we must properly address the root cause of test instability rather than masking it with parallel execution. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
vdusek
added
t-tooling
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #1693 +/- ##
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+ Coverage 92.45% 92.47% +0.01%
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Files 157 157
Lines 10482 10482
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+ Hits 9691 9693 +2
+ Misses 791 789 -2
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Mantisus
approved these changes
Jan 26, 2026
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Summary
Reduce unit tests concurrency from 2 to 1 to address test instability and flakiness, especially on Windows and macOS.
Context
Our tests are unstable when running with
pytest numprocesses > 1. This change helps determine if the instability is caused by parallel execution or underlying code/test issues.If we need higher concurrency in the future, we must properly fix the root cause rather than masking it with parallel execution.
Changes
tests_concurrency: "1"in.github/workflows/_tests.yaml🤖 Co-Authored-By: Claude Sonnet 4.5