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Tag: testing

23 posts · Page 1 of 3

2026-10-07 errors dotnet testing

Fix: dotnet test falls back to VSTest in a Linux CI pipeline even though the project uses Microsoft.Testing.Platform

dotnet test picks its runner from global.json found by walking up from the working directory. On Linux CI it falls back to VSTest when that file is missing, misnamed, has a mis-cased key, or the SDK is older than 10.

2026-10-06 mstest winui uwp

MSTest 4.5 Runs UWP and WinUI 3 UI Tests Without VSTest

MSTest.Sdk 4.5 and Microsoft.Testing.Platform 2.5 make the UWP or WinUI 3 app the test host itself. [UITestMethod] runs each test on the real dispatcher, packaged and AppContainer apps are activated by AUMID through a sidecar controller, and unpackaged WinUI finally works.

2026-10-04 nunit testing dotnet

NUnit 5: Assert.ThrowsAsync Now Returns a Task, and an Unawaited One Passes Silently

NUnit 5.0.0 makes Assert.ThrowsAsync, CatchAsync and DoesNotThrowAsync truly asynchronous. Forget the await and the assertion never runs. Here is what breaks, what the NUnit.Analyzers NUnit2059 rule catches, and the other NUnit 5 changes to check before upgrading.

2026-10-01 errors dotnet testing

Fix: dotnet test exits with code 5 and "Zero tests ran" on Microsoft.Testing.Platform

Exit code 5 means MTP rejected a command-line option, not that tests are missing. Run the test exe directly to see the real error, then add the extension package or route the option per project.

2026-09-17 mstest testing csharp

MSTest 4.4.1 Fixes the CS0121 Ambiguous Assert Calls That 4.4.0 Broke Below C# 14

MSTest 4.4.0 added Span<T> and ReadOnlySpan<T> overloads to Assert.Contains and Assert.DoesNotContain, which made ordinary array and string assertions fail with CS0121 on net8.0, net9.0, or any project below C# 14. MSTest 4.4.1, published on 2026-09-16, adds exact array overloads and constrained forwarders. Two explicit-generic call shapes still fail.

2026-09-15 dotnet ai microsoft-extensions-ai

Microsoft.Extensions.AI 10.10 Fails Evaluation Metrics the Judge Never Scored

Microsoft.Extensions.AI.Evaluation.Quality 10.10.0 now marks unparseable and out-of-range quality scores as failed, and Microsoft.Extensions.AI.OpenAI 10.10.0 drops the Assistants adapter. Measured before and after on 10.9.0.

2026-09-08 dotnet testing rider

Rider 2026.3 EAP: dotCover Finally Measures TUnit Coverage

The Rider 2026.3 Early Access Program opened on September 7, 2026. Buried under rainbow brackets is the one line that changes a build: dotCover now reports coverage for TUnit tests, given Microsoft.Testing.Platform 2.3.0 and one package reference.

2026-09-04 mstest native-aot testing

MSTest 4.4 Graduates the Reflection Source Generator, and Native AOT Projects Get It Automatically

MSTest 4.4 moves MSTest.SourceGeneration out of experimental and aligns it with the MSTest version. Native AOT test projects pick it up with no opt-in, ReflectionFree mode can now skip runtime discovery for plain [TestMethod] and [DataRow], and five AOTSG diagnostics tell you which test shapes will not survive.

2026-09-02 migration vstest microsoft-testing-platform

Migrate from VSTest to Microsoft.Testing.Platform on the .NET 11 SDK

A step-by-step migration from VSTest to Microsoft.Testing.Platform 2.3.3: the OutputType Exe opt-in, the global.json runner switch, loggers becoming reporters, .runsettings becoming testconfig.json, and the exit codes that turn a green CI job red.

2026-09-01 migration xunit xunit-v3

Migrate a test project from xUnit v2 to xUnit v3 (2.9.3 to 4.0.0)

A step-by-step migration from xunit 2.9.3 to xunit.v3 4.0.0: package swaps, the OutputType Exe change, IAsyncLifetime returning ValueTask, the Xunit.Abstractions removal, and the CI filter syntax that silently stops matching.