Flaky tests / lighter test queries#4344
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Hotfix 7.0.2
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Pull request overview
This pull request updates the SqlClient test suite by quarantining a small set of intermittently failing unit tests, replacing a manual transaction-pool cleanup scenario with a deterministic unit test, and reducing CPU/scan overhead in high-volume MARS manual tests (notably for Azure SQL environments).
Changes:
- Quarantines a few simulated-server transient fault/failover tests as
Category=flakywith inline failure notes where helpful. - Adds a deterministic unit test validating that pool pruning does not impact transacted connections, and exposes the pruning callback internally to support that test.
- Optimizes MARS manual test queries to avoid expensive system scanning (
sys.databases,sp_who) while still producing sufficient observable request activity.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/ConnectionTests.cs | Marks select transient-fault test cases as flaky to prevent intermittent CI failures. |
| src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/ConnectionFailoverTests.cs | Quarantines an intermittently failing failover-related async test with a documented failure symptom. |
| src/Microsoft.Data.SqlClient/tests/UnitTests/ConnectionPool/WaitHandleDbConnectionPoolTransactionTest.cs | Adds a pruning-focused unit test asserting transacted connections are not pruned/destroyed. |
| src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/MARSSessionPoolingTest/MarsSessionPoolingTest.cs | Replaces high-cost SQL text/SP usage with lighter alternatives to reduce CPU/scan impact while preserving test intent. |
| src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionPoolTest/TransactionPoolTest.cs | Removes the older manual transaction-cleanup test (scenario now covered deterministically via unit test). |
| src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ConnectionPool/WaitHandleDbConnectionPool.cs | Makes the pruning callback internal (with documentation) so unit tests can invoke pruning deterministically. |
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paulmedynski
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Jun 6, 2026
apoorvdeshmukh
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Jun 8, 2026
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Marks a few flaky tests. Rewrites a manual test as a unit test. Reduces CPU/scan impact on a few high volume tests queries.