dotnet/winforms

Random failures in InputLanguage_FromCulture_SupplementalInputLanguages_Expected

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#13,274 opened on Apr 9, 2025

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Description

Test

InputLanguage_FromCulture_SupplementalInputLanguages_Expected

Issue description

Run test InputLanguage_FromCulture_SupplementalInputLanguages_Expected on my local machine, one or two or even three test scenarios ​​will fail because language returns null after executing the following code

InstallUserLanguage(languageTag);
CultureInfo culture = new(languageTag);
InputLanguage language = InputLanguage.FromCulture(culture);

But running them individually all pass and this problem does not occur in the pipeline run. AfterChange

Contributor guide

Tech stack
csharp
Domain
desktoptesting
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C#.NET testingWindows Forms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate why `InputLanguage.FromCulture` returns `null` when tests are run together but not individually. Check if `InstallUserLanguage` has side effects that interfere with subsequent calls. Look for shared state or static variables in the test class that could cause ordering dependencies. Consider adding a retry mechanism or ensuring cleanup between tests.
Random failures in InputLanguage_FromCulture_SupplementalInputLanguages_Expected · dotnet/winforms#13274 | Good First Issue