`dotnet test` does not work for WASM libraries tests

Open

#119,358 opened on Sep 4, 2025 4 comments 0 reactions 1 assignee View on GitHub

@akoeplinger is already working on this.

Since Sep 9, 2025.

Assessment

This issue has not been assessed yet.

Description

arch-wasm area-Infrastructure-libraries

Writing this purely in the spirit of https://github.com/dotnet/runtime/issues/94183#issuecomment-3254389607, feel free to close / move this issue.

Currently if you try to do:

dotnet test /p:TargetOS=wasi /p:TargetArchitecture=wasm .\tests\System.Collections.Specialized.Tests.csproj

It will fail with:

Settings file provided does not conform to required format. An error occurred while loading the settings.  Error: Invalid setting 'RunConfiguration'. Invalid value 'wasm' specified for 'TargetPlatform'..
Unhandled exception. System.TypeInitializationException: The type initializer for 'Microsoft.VisualStudio.TestPlatform.Client.TestPlatform' threw an exception.
 ---> Microsoft.VisualStudio.TestPlatform.ObjectModel.SettingsException: Invalid settings 'RunConfiguration'.  Invalid value 'wasm' specified for 'TargetPlatform'.
   at Microsoft.VisualStudio.TestPlatform.ObjectModel.RunConfiguration.FromXml(XmlReader reader) in /_/src/vstest/src/Microsoft.TestPlatform.ObjectModel/RunSettings/RunConfiguration.cs:line 781
   at Microsoft.VisualStudio.TestPlatform.ObjectModel.Utilities.XmlRunSettingsUtilities.GetNodeValue[T](String settingsXml, String nodeName, Func`2 nodeParser) in /_/src/vstest/src/Microsoft.TestPlatform.ObjectModel/Utilities/XmlRunSettingsUtilities.cs:line 377
   at Microsoft.VisualStudio.TestPlatform.ObjectModel.Utilities.XmlRunSettingsUtilities.GetRunConfigurationNode(String settingsXml) in /_/src/vstest/src/Microsoft.TestPlatform.ObjectModel/Utilities/XmlRunSettingsUtilities.cs:line 136
   at Microsoft.VisualStudio.TestPlatform.Client.TestPlatform.AddExtensionAssembliesFromExtensionDirectory() in /_/src/vstest/src/Microsoft.TestPlatform.Client/TestPlatform.cs:line 283
   --- End of inner exception stack trace ---

dotnet msbuild /t:Test works as expected:

dotnet msbuild /p:TargetOS=wasi /p:TargetArchitecture=wasm /t:Test .\tests\System.Collections.Specialized.Tests.csproj

...
  info: === TEST EXECUTION SUMMARY ===
  info: Tests run: 2131 Passed: 2123 Inconclusive: 0 Failed: 0 Ignored: 0 Skipped: 8
...

Dominant language: C#
Stars: 18.3k
Forks: 5.6k
PR merge metrics: PR metrics pending

Contributor guide

Open the contributing guide

First steps

Read the whole issue, then the project's contributing guide.
Comment on the issue to say you are picking it up — it saves two people doing the same work.
Fork the repository and make your change on a branch.
Open a pull request that references the issue number.

Similar issues

Tsavorite.test fails to compile on main: TestBase.cs references Garnet.test.TestUtils, which is not linked into Tsavorite.test.csproj Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

microsoft/garnet#2161 · 2 comments · Opened Sep 20, 2026
v11 update: Validation attributes are no longer experimental Open

:watch: Not Triaged 11.0 fundamentals/subsvc

Difficulty 2/5 1-3 hours Newbie friendliness 92/100

dotnet/AspNetCore.Docs#37699 · Opened Sep 20, 2026
SE 5.3.0 beta 7: In Settings Video player download buttons aren't together Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

SubtitleEdit/subtitleedit#15108 · 1 comment · Opened Sep 20, 2026
Kubernetes get-started create-component.md: Go and C# silently default isMinikube instead of requiring it, unlike TS/Python/Java/HCL Open

area/docs-content Bug pulumi/docs

Difficulty 1/5 1-3 hours Newbie friendliness 94/100

pulumi/docs#21762 · Opened Sep 20, 2026
Create parent directories only after the containment check in InstallHelper.TryExtractToDirectory Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

PowerShell/PSResourceGet#2056 · Opened Sep 20, 2026

More C# issues