Fixes #4787. Upgrade all nuget packages including the obsolete xunit v2

[BDisp]

Fixes

• Fixes Upgrade all nuget packages including the obsolete xunit v2 #4787

Proposed Changes/Todos

• Remove all symbols [,) from Directory.Packages.props
• Rename TestContext to FluentTestContext
• Fix the generator xunit extensions
• Fix some code and unit tests

Pull Request checklist:

• I've named my PR in the form of "Fixes #issue. Terse description."
• My code follows the style guidelines of Terminal.Gui - if you use Visual Studio, hit CTRL-K-D to automatically reformat your files before committing.
• My code follows the Terminal.Gui library design guidelines
• I ran dotnet test before commit
• I have made corresponding changes to the API documentation (using /// style comments)
• My changes generate no new warnings
• I have checked my code and corrected any poor grammar or misspellings
• I conducted basic QA to assure all features are working

[tig]

This is clearly not ready. Why does it touch 190 files?

[tig]

Not a fan of "Rename TestContext to FluentTestContext". I chose TextContext carefully. It actually only enabls Fluent sytle as a side-effect.

[BDisp]

This is clearly not ready. Why does it touch 190 files?

Most of the files have been modified because the using Xunit.Abstractions; was removed as it was no longer needed.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (057178b) to head (abf604b).

Files with missing lines	Patch %	Lines
Terminal.Gui/Drivers/UnixDriver/UnixClipboard.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           v2_develop   #4788       +/-   ##
==============================================
- Coverage       77.62%   0.00%   -77.63%     
==============================================
  Files             463     463               
  Lines           45679   45679               
  Branches         6815    6815               
==============================================
- Hits            35458       0    -35458     
- Misses           8233   45679    +37446     
+ Partials         1988       0     -1988     

Files with missing lines	Coverage Δ
Terminal.Gui/Drivers/UnixDriver/UnixClipboard.cs	0.00% <0.00%> (ø)

... and 436 files with indirect coverage changes

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[BDisp]

Not a fan of "Rename TestContext to FluentTestContext". I chose TextContext carefully. It actually only enabls Fluent sytle as a side-effect.

The name isn't the issue, it can be whatever you want. What's unacceptable is continuing to call it TestContext because xunit.v3 already contains an object with the same name, which creates a conflict. Everything worked fine on my machine. I don't understand why.

[BDisp]

Would probably fixes the #4569?

[tig]

This PR upgraded to xunit.v3 and removed Microsoft.NET.Test.Sdk and xunit.runner.visualstudio, but didn't add the xUnit v3 equivalent for dotnet test integration.

As a result dotnet test no longer works, nor does reshaper testing.

I addition all of the workflow results are bogus because no tests are actually being run:

I'm working on a fix now.

[BDisp]

I had to remove them all, otherwise it caused errors in the CI pipelines.

[tig]

I had to remove them all, otherwise it caused errors in the CI pipelines.

You got rid of the errors in the CI pipelines because no tests were being run! I'm fixing this now.

[BDisp]

You got rid of the errors in the CI pipelines because no tests were being run! I'm fixing this now.

Sorry, I didn't even notice that. Thanks.

xunit.v3 now creates executable files (.exe) for Windows and files without an extension for Linux/Mac.

[tig]

Ok, I think this is good now. You should double check my work.

[Copilot]

Pull request overview

Upgrades the repo’s NuGet dependencies (notably moving from xUnit v2 → xUnit v3) and updates the test/tooling infrastructure to match, including renaming the fluent testing helper library and adjusting CI workflows.

Changes:

• Migrate test projects and helper attributes to xUnit v3 APIs and update many tests accordingly.
• Rename/move fluent testing helpers to AppTestHelpers (+ generator + integration test updates).
• Update CLI parsing in examples (System.CommandLine) and simplify GitHub Actions test workflows.

Reviewed changes

Copilot reviewed 210 out of 213 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
global.json	Adds test runner configuration (Microsoft.Testing.Platform).
Directory.Packages.props	Updates central package versions (xUnit v3, tooling, logging, etc.).
.github/workflows/unit-tests.yml	Switches CI to build in-job and run tests with diagnostic output.
.github/workflows/stress-tests.yml	Updates stress test invocation and diagnostic collection.
.github/workflows/integration-tests.yml	Updates integration test invocation and diagnostic collection.
.github/workflows/README.md	Updates workflow documentation to match new invocation patterns.
Terminal.sln	Renames solution projects to AppTestHelpers*.
Terminal.Gui/Terminal.Gui.csproj	Updates InternalsVisibleTo to the renamed helper assembly.
Terminal.Gui/Drivers/UnixDriver/UnixClipboard.cs	Converts ctor body to expression-bodied assignment.
Terminal.Gui/Drivers/Input/IInput.cs	Updates docs to reference AppTestHelper.
Terminal.Gui/App/Clipboard/ClipboardProcessRunner.cs	Adds early-return behavior when console I/O is redirected.
Examples/UICatalog/UICatalog.cs	Migrates System.CommandLine setup/handlers to newer APIs.
Examples/UICatalog/Scenarios/Editor.cs	Switches checkbox handlers from ValueChanging to ValueChanged and adjusts culture changes.
Examples/ScenarioRunner/Program.cs	Migrates ScenarioRunner CLI to newer System.CommandLine APIs.
Examples/ReactiveExample/Program.cs	Reworks ReactiveUI setup to use builder API.
Examples/ReactiveExample/LoginView.cs	Uses scheduler from builder rather than RxApp.MainThreadScheduler.
Tests/UnitTestsParallelizable/UnitTests.Parallelizable.csproj	Updates packages to xUnit v3 + runner, adjusts test project properties and references.
Tests/UnitTests/UnitTests.csproj	Updates packages to xUnit v3 + runner, adjusts test project properties and references.
Tests/IntegrationTests/IntegrationTests.csproj	Updates packages and references to AppTestHelpers*.
Tests/StressTests/StressTests.csproj	Updates packages to xUnit v3 and adjusts test project settings.
Tests/TerminalGuiFluentTestingXunit/XunitContextExtensions.cs	Moves xUnit fluent helper extensions into AppTestHelpers.XunitHelpers.
Tests/TerminalGuiFluentTestingXunit/TerminalGuiFluentTestingXunit.csproj	Renames/moves project references and updates packages (xUnit v3).
Tests/TerminalGuiFluentTestingXunit.Generator/TheGenerator.cs	Updates generator namespaces/usings and generated method bodies for renamed helper context.
Tests/TerminalGuiFluentTesting/With.cs	Renames namespace/types from TerminalGuiFluentTesting → AppTestHelpers.
Tests/TerminalGuiFluentTesting/ThreadSafeStringWriter.cs	Renames namespace to AppTestHelpers.
Tests/TerminalGuiFluentTesting/TextWriterLoggerProvider.cs	Renames namespace to AppTestHelpers.
Tests/TerminalGuiFluentTesting/TextWriterLogger.cs	Renames namespace to AppTestHelpers.
Tests/TerminalGuiFluentTesting/TestDriver.cs	Renames namespace to AppTestHelpers.
Tests/TerminalGuiFluentTesting/TestContext.cs	Renames TestContext → AppTestHelper and adjusts fluent API return types.
Tests/TerminalGuiFluentTesting/TestContext.ViewBase.cs	Updates partial class + fluent method return types to AppTestHelper.
Tests/TerminalGuiFluentTesting/TestContext.Navigation.cs	Updates partial class + fluent method return types to AppTestHelper.
Tests/TerminalGuiFluentTesting/TestContext.Input.cs	Updates partial class + fluent method return types to AppTestHelper.
Tests/TerminalGuiFluentTesting/TestContext.ContextMenu.cs	Updates partial class + fluent method return types to AppTestHelper.
Tests/IntegrationTests/FluentTests/TreeViewTests.cs	Updates integration tests to use AppTestHelper and new helper namespaces.
Tests/IntegrationTests/FluentTests/TextFieldTests.cs	Updates integration tests to use AppTestHelper and new helper namespaces.
Tests/IntegrationTests/FluentTests/TestContextTests.cs	Updates integration tests/docs to AppTestHelper.
Tests/IntegrationTests/FluentTests/TestContextMouseEventTests.cs	Updates integration tests/docs to AppTestHelper.
Tests/IntegrationTests/FluentTests/TestContextKeyEventTests.cs	Updates integration tests/docs to AppTestHelper.
Tests/IntegrationTests/FluentTests/PopverMenuTests.cs	Updates integration tests to use AppTestHelper and new helper namespaces.
Tests/IntegrationTests/FluentTests/NavigationTests.cs	Updates integration tests to use AppTestHelper.
Tests/IntegrationTests/FluentTests/MenuBarTests.cs	Updates integration tests to use AppTestHelper and new helper namespaces.
Tests/IntegrationTests/FluentTests/LinearRangeFluentTests.cs	Updates integration tests to use AppTestHelper.
Tests/IntegrationTests/FluentTests/FileDialogTests.cs	Updates integration tests to use AppTestHelper and new helper namespaces.
Tests/UnitTestsParallelizable/TestDateAttribute.cs	Migrates BeforeAfterTestAttribute usage to xUnit v3 signature.
Tests/UnitTests/TestRespondersDisposedAttribute.cs	Migrates BeforeAfterTestAttribute usage to xUnit v3 signature.
Tests/UnitTests/SetupFakeApplicationAttribute.cs	Migrates BeforeAfterTestAttribute usage to xUnit v3 signature.
Tests/UnitTests/AutoInitShutdownAttribute.cs	Migrates BeforeAfterTestAttribute usage to xUnit v3 signature.
Tests/UnitTests/Views/TextViewTests.cs	Updates xUnit attribute hooks to xUnit v3 signatures.
Tests/UnitTests/Views/TextFieldTests.cs	Updates xUnit attribute hooks to xUnit v3 signatures.
Tests/UnitTests/Views/LabelTests.cs	Updates nullability for Record.Exception result.
Tests/UnitTestsParallelizable/** (many files)	Primarily removes Xunit.Abstractions usings and updates async/task usage to flow cancellation tokens via TestContext.Current.CancellationToken.

Comments suppressed due to low confidence (2)

Tests/UnitTestsParallelizable/ViewBase/Keyboard/AutoHotKeyAssignmentTests.cs:1

• This test mutates Thread.CurrentThread.CurrentUICulture but doesn’t restore it. In a parallel test suite, that can leak state into other tests running on the same thread later. Wrap the change in a try/finally (restore previous culture), or use a scoped helper/attribute that guarantees restoration.
  Tests/UnitTests/UnitTests.csproj:1
• xunit.runner.visualstudio is usually marked with PrivateAssets="all" (and a constrained IncludeAssets) to avoid it flowing transitively and to keep it clearly test-only. Consider restoring the previous PrivateAssets/IncludeAssets block (same applies to other test projects updated similarly).

[tig]

Fix: dotnet test and ReSharper test discovery broken after xUnit v3 upgrade

What was wrong

The xUnit v3 upgrade replaced VSTest with Microsoft Testing Platform (MTP) but didn't update the project configuration or CI workflows to account for the differences:

1. dotnet test found zero tests — xUnit v3 removed Microsoft.NET.Test.Sdk and xunit.runner.visualstudio (the VSTest adapter). Without these, dotnet test couldn't discover any tests. The .NET SDK also requires <IsTestProject>true</IsTestProject> to recognize test projects when Microsoft.NET.Test.Sdk is absent.

2. ReSharper couldn't discover tests — ReSharper uses VSTest for test discovery, which requires Microsoft.NET.Test.Sdk and xunit.runner.visualstudio.

3. CI workflows used VSTest-specific syntax — dotnet test with MTP requires --project instead of positional paths, doesn't support --blame* flags, --coverage requires an extra package, and --diagnostic-output-directory requires --diagnostic.

4. Cross-platform CI was broken — The old workflow built once on Linux and shared artifacts across OSes. MTP runs the native app host executable directly (unlike VSTest which used dotnet exec on the .dll), so Linux-built ELF binaries can't run on macOS/Windows.

What was fixed

• global.json: Added "test": { "runner": "Microsoft.Testing.Platform" } to enable MTP for dotnet test (required for .NET 10 SDK)
• Directory.Packages.props: Added Microsoft.NET.Test.Sdk 18.3.0 and xunit.runner.visualstudio 3.1.5 for backward compatibility with IDEs (per xUnit v3 migration guidance)
• All test .csproj files: Added <IsTestProject>true</IsTestProject>, Microsoft.NET.Test.Sdk, and xunit.runner.visualstudio package references
• CI workflows: Updated to MTP syntax (--project, --diagnostic, removed --blame*/--coverage), each OS now builds locally instead of sharing cross-platform artifacts
• All documentation: Updated dotnet test commands across 9 markdown files

[BDisp]

Well done. Thanks for your help.

[tig]

Well done. Thanks for your help.

Thank you for taking this on... getting to xunit3 felt daunting to me. It's great having it done.