[6.1] Test | Fix Transient Fault handling and other flaky unit tests (#4080)#4269
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* Test | Fix Transient Fault handling flaky tests * Attempt to fix * Fix the MultiPartIdentifier tests getting skipped * Fix serialization issue of SqlTypeWorkaroundsTests * Fix one more cases of possible error scenarios
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Pull request overview
Ports the fixes from #4080 onto release/6.1, primarily stabilizing simulated-server unit tests around transient fault retry behavior on .NET Framework (TNIR/interval-timer retries) and addressing a few other flaky-test/discovery issues.
Changes:
- Make simulated-server retry assertions deterministic by tracking
Login7attempts and accounting for “abandoned”PreLoginattempts. - Reduce flakiness from pooling interactions in several simulated-server failover/routing tests (e.g., disabling pooling in specific cases, clearing pools in one test).
- Fix xUnit discovery issues by setting
DisableDiscoveryEnumeration = trueon selected[MemberData]usages.
Reviewed changes
Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/ConnectionTests.cs | Updates transient/network retry assertions and adjusts connection-string settings to reduce flakiness. |
| src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/ConnectionRoutingTestsAzure.cs | Updates routing retry assertions to account for abandoned pre-logins. |
| src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/ConnectionRoutingTests.cs | Updates routing retry assertions to account for abandoned pre-logins. |
| src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/ConnectionFailoverTests.cs | Adjusts pooling behavior and assertions for failover scenarios; adds pool clearing in one test. |
| src/Microsoft.Data.SqlClient/tests/UnitTests/Microsoft/Data/SqlTypes/SqlTypeWorkaroundsTests.cs | Uses DisableDiscoveryEnumeration to fix test discovery/enumeration issues. |
| src/Microsoft.Data.SqlClient/tests/tools/TDS/TDS.Servers/TransientTdsErrorTdsServer.cs | Ensures Login7 is counted even when returning an error without calling base handler. |
| src/Microsoft.Data.SqlClient/tests/tools/TDS/TDS.Servers/GenericTdsServer.cs | Adds Login7Count + derived abandoned-prelogin metric; refactors endpoint initialization; increments login count on login handler. |
mdaigle
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May 11, 2026
paulmedynski
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May 13, 2026
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I agree with the Copilot feedback.
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Ports #4080 to release/6.1 branch.