System.Diagnostics.Tests.ProcessStartInfoTests.TestWindowStyle failing in CI

[jakobbotsch]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1144025
Build error leg or test failing: System.Diagnostics.Tests.ProcessStartInfoTests.TestWindowStyle
Pull request: #119528

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": ["System.Diagnostics.Tests.ProcessStartInfoTests.TestWindowStyle", "Assert.True() Failure", "Expected: True"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1144025
Error message validated: [System.Diagnostics.Tests.ProcessStartInfoTests.TestWindowStyle Assert.True() Failure Expected: True]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/10/2025 12:16:36 PM UTC

Report

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0

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[MihuBot]

I'm a bot. Here are possible related and/or duplicate issues (I may be wrong):

• System.Diagnostics.Tests.ProcessStartInfoTests.TestWindowStyle tests failing #100647
• System.Diagnostics.Tests.ProcessStartInfoTests.TestWindowStyle failing in CI #89842

[adamsitnik]

It's a flaky test that fails once per year (see #100647 and #89842), so for now I am moving it to Future and removing "blocking-clean-ci"