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18.10.0

What's Changed

• Drop Mono fallback, run .NET Framework tests on Windows only by @​nohwnd in Drop Mono fallback, run .NET Framework tests on Windows only microsoft/vstest#16158
• Run Microsoft.Testing.Platform test apps under vstest.console and datacollector by @​nohwnd in Run Microsoft.Testing.Platform test apps under vstest.console and datacollector microsoft/vstest#16201
• Fix test output eaten by MSBuild terminal logger by @​nohwnd in [fix] Fix test output eaten by MSBuild terminal logger microsoft/vstest#16223
• Remove the experimental test session feature by @​nohwnd in Remove the experimental test session feature microsoft/vstest#16231
• Skip a single bad executor instead of failing all executor loading by @​nohwnd in Skip a single bad executor instead of failing all executor loading microsoft/vstest#16239
• Assert apartment state instead of using Clipboard in UI tests by @​nohwnd in Assert apartment state instead of using Clipboard in UI tests microsoft/vstest#16270
• Surface test host crashes during protocol negotiation by @​nohwnd in Surface test host crashes during protocol negotiation microsoft/vstest#16285
• Pass the inferred target platform to the host in run settings by @​nohwnd in Pass the inferred target platform to the host in run settings microsoft/vstest#16271
• Report raw invalid IsTargetPlatformInferred value, cover host x64 forcing by @​nohwnd in Report raw invalid IsTargetPlatformInferred value, cover host x64 forcing microsoft/vstest#16295
• Disable the MTP testhost by default (#​16337) by @​nohwnd in [rel/18.10] Disable the MTP testhost by default (#16337) microsoft/vstest#16341

Full Changelog: microsoft/vstest@v18.9.0...v18.10.0

18.9.0

What's Changed

• Fix tilde/exclamation characters corrupted in TerminalLogger test output by @​nohwnd in [fix] Fix tilde/exclamation characters corrupted in TerminalLogger test output microsoft/vstest#16046
• Make TranslationLayer Native AOT-compatible by @​drewnoakes in Make TranslationLayer Native AOT-compatible microsoft/vstest#16045
• Guard GenerateProgramFile target against UseWinUI/UseUwpTools evaluation order by @​nohwnd in [fix] fix: guard GenerateProgramFile target against UseWinUI/UseUwpTools evaluation order microsoft/vstest#16072
• Add RequestingAssembly to AssemblyResolveEventArgs for binary compat by @​nohwnd in [fix] fix: add RequestingAssembly to AssemblyResolveEventArgs for binary compat microsoft/vstest#16076
• Remove stale Microsoft.Extensions.FileSystemGlobbing binding redirect from testhost.x86 and datacollector by @​Evangelink in Remove stale Microsoft.Extensions.FileSystemGlobbing binding redirect from testhost.x86 and datacollector microsoft/vstest#16082
• Fix TRX attachment paths when LogFileName contains a subdirectory by @​nohwnd in [fix] Fix TRX attachment paths when LogFileName contains a subdirectory microsoft/vstest#15791
• Fix missing dumps for .NET Framework child processes in NetClientHangDumper by @​nohwnd in [fix] Fix missing dumps for .NET Framework child processes in NetClientHangDumper microsoft/vstest#16098
• Fix data collection channels to use negotiated protocol version instead of V1 by @​nohwnd in [fix] Fix data collection channels to use negotiated protocol version instead of V1 microsoft/vstest#16096
• Fix race condition in BlameCollector: skip hang dump when testhost hasn't launched yet by @​nohwnd in [fix] Fix race condition in BlameCollector: skip hang dump when testhost hasn't launched yet microsoft/vstest#16065
• Replace TestSDKAutoGeneratedCode with ExcludeFromCodeCoverage in auto-generated Program files by @​nohwnd in [fix] Replace TestSDKAutoGeneratedCode with ExcludeFromCodeCoverage in auto-generated Program files microsoft/vstest#16101
• Include testhost process path in crash error messages by @​nohwnd in [fix] Include testhost process path in crash error messages microsoft/vstest#16108
• Fix DataDriven test results being double-counted in TRX logger totals by @​nohwnd in [fix] Fix DataDriven test results being double-counted in TRX logger totals microsoft/vstest#15766
• Fix datacollector crash visibility: replace Assert with throwable exceptions by @​nohwnd in [fix] Fix datacollector crash visibility: replace Assert with throwable exceptions microsoft/vstest#16048
• Add TreatErrorMessagesAsWarnings parameter to TRX logger by @​nohwnd in [fix] Add TreatErrorMessagesAsWarnings parameter to TRX logger microsoft/vstest#16106
• Wait for testhost stderr to drain before reading its crash output by @​nohwnd in Wait for testhost stderr to drain before reading its crash output microsoft/vstest#16128
• Handle runtimeconfig.dev.json without additionalProbingPaths by @​tmat in Handle runtimeconfig.dev.json without additionalProbingPaths microsoft/vstest#16166
• Suggest Microsoft.NET.Test.Sdk when a managed test project brings no testhost by @​nohwnd in Suggest Microsoft.NET.Test.Sdk when a managed test project brings no testhost microsoft/vstest#16169
• Fix x86 testhost loading mismatched x64 hostfxr (0x800700C1) when run via vstest.console.exe directly (#​16151) by @​azat-msft in Fix x86 testhost loading mismatched x64 hostfxr (0x800700C1) when run via vstest.console.exe directly (#16151) microsoft/vstest#16156
• Preserve the real exception (type + stack trace) when a test run aborts in BaseRunTests by @​nohwnd in [fix] Preserve the real exception (type + stack trace) when a test run aborts in BaseRunTests microsoft/vstest#16167

New Contributors

• @​drewnoakes made their first contribution in Make TranslationLayer Native AOT-compatible microsoft/vstest#16045

Full Changelog: microsoft/vstest@v18.8.0...v18.9.0

18.8.1

What's Changed

• Fix protocol negotiation timeout when STJ reflection is disabled (18.8.1) by @​nohwnd in Fix protocol negotiation timeout when STJ reflection is disabled (18.8.1) microsoft/vstest#16281

Full Changelog: microsoft/vstest@v18.8.0...v18.8.1

18.8.0

What's Changed

• Migrate from Newtonsoft.Json to System.Text.Json / Jsonite (merge to main) by @​nohwnd in feat: migrate from Newtonsoft.Json to System.Text.Json / Jsonite (merge to main) microsoft/vstest#15687
  • For more detail refer to https://devblogs.microsoft.com/dotnet/vs-test-is-removing-its-newtonsoft-json-dependency/
• Create source-only filter package by @​Youssef1313 in Create source-only filter package microsoft/vstest#15638
• Add ARM64 msdia140.dll support to test platform packages by @​nohwnd in Cherry-pick: Add ARM64 msdia140.dll support to test platform packages microsoft/vstest#15692
• Fix mutex cleanup crash on macOS/Linux by @​nohwnd in Fix mutex cleanup crash on macOS/Linux microsoft/vstest#15684
• Restrict artifact temp directory permissions on Unix by @​nohwnd in Restrict artifact temp directory permissions on Unix microsoft/vstest#15729
• Add support for filtering uncategorized tests with TestCategory=None by @​Evangelink in Add support for filtering uncategorized tests with TestCategory=None microsoft/vstest#15727
• Fix SCI binding failure in DTA hosts (main) by @​nohwnd in Fix SCI binding failure in DTA hosts (main) microsoft/vstest#15724
• Fix HTML logger parallel file collision by @​nohwnd in [fix] Fix HTML logger parallel file collision microsoft/vstest#15435
• Improve error message when testhost cannot be found by @​nohwnd in [fix] Improve error message when testhost cannot be found microsoft/vstest#16053
• Fix HTML logger exception on invalid XML chars in test display names by @​nohwnd in [fix] Fix HTML logger exception on invalid XML chars in test display names microsoft/vstest#16051

Full Changelog: microsoft/vstest@v18.7.0...v18.8.0

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Sourced from Microsoft.OpenApi's releases.

2.12.0

2.12.0 (2026-08-12)

Features

• adds deserialization of the example extension (095ae3b)
• serialize license identifier as extension for earlier versions (d5cdce8)
• serialize license identifier as extension for earlier versions (fde38d8)

Bug Fixes

• better nullability round-tripping (7a25659)
• bound YAML anchor/alias expansion to prevent OOM (billion laughs) (#​3000) (a361360)
• bound YAML anchor/alias expansion to prevent OOM (billion laughs) (#​3000) (4db9af0)
• library: serialize multiple schema types as anyOf/oneOf for OpenAPI 3.0 (6568896)
• marks deprecated properties from the specification as obsolete (26aba69)
• marks deprecated properties from the specification as obsolete (abc5301)
• schema: serialize compatibility examples from examples list (be57a7c)
• serialize examples as extension in v2/v3 (d27141b)

2.11.0

2.11.0 (2026-07-15)

Features

• adds support for anchor and id external resolution (557bd6a)
• adds support for anchor and id external resolution (4138e47)
• schema: resolve bare $dynamicRef via $dynamicAnchor index (#​2913) (baf8428)
• schema: resolve bare $dynamicRef via $dynamicAnchor index (#​2913) (a139f83)
• support relative URI resolution in $dynamicRef (#​2928) (#​2945) (6091f5a)
• support relative URI resolution in $dynamicRef (#​2928) (#​2945) (a8688dc)

Bug Fixes

• adds explicit error message for invalid json pointers (#​2955) (a304e56)
• differentiate unset value from null value in OpenApiSchema.Const (#​2936) (a8787af)
• differentiate unset value from null value in OpenApiSchema.Const (#​2936) (e08570f)
• handle nullability more accurately during serialization for 3.0/2.0 (#​2933) (bc11356)
• handle nullability more accurately during serialization for 3.0/2.0 (#​2933) (310b6e2)

2.10.0

2.10.0 (2026-07-03)

Features

• add JsonConverter for OpenApiSchema System.Text.Json serialization (#​2915) (465521b)
• library: support schema keywords on references (2749463), closes #​2903

Bug Fixes

• Don't silently skip null assignment to OpenApiDocument.Tags (#​2917) (6a45a82)
• handling of nullable enums for 3.0 (#​2920) (f4778e0)
• library: keep v3 schema references ref-only (8d811c3)
• preserve JSON Schema 2020-12 keyword siblings on $ref schemas for OAS 3.1+ (#​2896) (fb20d46)
• preserve JSON Schema 2020-12 keyword siblings on $ref schemas for OAS 3.1+ (#​2896) (c79a83e)
• use async method for crypto flush (677b519)

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2.3.0-preview-20220810-02

See release notes here.

2.2.10

See release notes here.

2.2.10-preview-20220414-01

See release notes here.

2.2.9

Parallel output

🙇 Shout out to @​SimonCropp, for bringing this functionality to XUnit in his https://github.com/SimonCropp/XunitContext project. And being an inspiration for implementing this.

MSTest 2.2.9 captures all Console output and attaches it to the correct test, even if you are running tests in parallel. This output is captured from your test code as well as from the tested code. And it requires no special setup.

Before

In 2.2.8, test output is scattered among tests, in our example, one unlucky test gets all the output of other tests just mixed together:

After

With 2.2.9, each output is correctly attached to the test that produced it:

Also notice that we are also capturing debug, trace and error. And we are not awaiting the FastChild method, and the output is still assigned correctly. Souce code.

Limitations

Due to the way that class and assembly initialize, and cleanup are invoked, their output will end up in the first test that run (or last for cleanup). This is unfortunately not easily fixable.

See release notes here.

2.2.8

See release notes here.

2.2.7

See release notes here.

2.2.6

See release notes here.

2.2.5

See release notes here.

2.2.4

See release notes here.

2.2.4-preview-20210331-02

See release notes here.

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