Add --test-runner option to global.json template

[Copilot]

• Add --test-runner option to global.json template
• Add integration tests for the new option
• Update TestRunner parameter to use "Microsoft.Testing.Platform" in both description and displayName (addressing @Youssef1313's feedback)
• Fix comma placement in global.json template (addressing @Youssef1313's feedback)

Changes Made

1. Template Configuration: Added TestRunner parameter to the global.json template configuration with two supported choices:

   • VSTest - Use the VSTest test runner
   • Microsoft.Testing.Platform - Use the Microsoft.Testing.Platform test runner

2. Template Logic: Updated the global.json template to conditionally include a test section when the --test-runner option is provided, using template engine conditional syntax.

3. Integration Tests: Added comprehensive test cases to verify the new functionality works correctly with various parameter combinations.

4. Fixed Parameter Names: Updated both description and displayName for the Microsoft.Testing.Platform choice to use the dotted format "Microsoft.Testing.Platform" instead of "Microsoft Testing Platform" per feedback.

5. Fixed JSON Formatting: Moved the comma from its own line to the end of the preceding line to follow proper JSON formatting conventions.

Behavior

• dotnet new globaljson → Creates global.json with only the SDK section (no test section)
• dotnet new globaljson --test-runner VSTest → Creates global.json with SDK section plus test section containing "runner": "VSTest"
• dotnet new globaljson --test-runner Microsoft.Testing.Platform → Creates global.json with SDK section plus test section containing "runner": "Microsoft.Testing.Platform"

The option supports both long form (--test-runner) and short form (-T), and provides proper error handling for invalid values.

Fixes #50753.

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

[Copilot]

Pull Request Overview

Adds a new --test-runner option to the global.json template, allowing users to specify which test runner to use when creating global.json files. The PR implements template parameter support for VSTest and Microsoft.Testing.Platform runners, includes comprehensive localization, and adds integration tests to verify the functionality.

Key Changes

• Added TestRunner parameter to global.json template with VSTest and Microsoft.Testing.Platform choices
• Updated global.json template logic to conditionally include test section based on the parameter
• Added comprehensive integration tests covering various parameter combinations

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 15 comments.

Show a summary per file

File	Description
template.json	Adds TestRunner parameter configuration with choice options
global.json	Updates template to conditionally include test runner configuration
dotnetcli.host.json	Maps TestRunner parameter to --test-runner CLI option
CommonTemplatesTests.cs	Adds integration test cases for new test runner functionality
templatestrings.*.json	Provides localization strings for all supported languages
DotnetNewHelpTests verification file	Updates expected help output to include new test-runner option

[Copilot]

The parameter name should use lowercase format --test-runner instead of --TestRunner to match the CLI convention used in the existing test cases and the configuration in dotnetcli.host.json.

Suggested change

	[InlineData("global.json file", "globaljson", new[] { "--TestRunner", "VSTest" })]
	[InlineData("global.json file", "globaljson", new[] { "--TestRunner", "Microsoft.Testing.Platform" })]
	[InlineData("global.json file", "globaljson", new[] { "--sdk-version", "6.0.200", "--TestRunner", "VSTest" })]
	[InlineData("global.json file", "globaljson", new[] { "--roll-forward", "major", "--TestRunner", "Microsoft.Testing.Platform" })]
	[InlineData("global.json file", "global.json", null)]
	[InlineData("global.json file", "global.json", new[] { "--sdk-version", "6.0.200" })]
	[InlineData("global.json file", "global.json", new[] { "--sdk-version", "6.0.200", "--roll-forward", "major" })]
	[InlineData("global.json file", "global.json", new[] { "--TestRunner", "VSTest" })]
	[InlineData("global.json file", "global.json", new[] { "--TestRunner", "Microsoft.Testing.Platform" })]
	[InlineData("global.json file", "globaljson", new[] { "--test-runner", "VSTest" })]
	[InlineData("global.json file", "globaljson", new[] { "--test-runner", "Microsoft.Testing.Platform" })]
	[InlineData("global.json file", "globaljson", new[] { "--sdk-version", "6.0.200", "--test-runner", "VSTest" })]
	[InlineData("global.json file", "globaljson", new[] { "--roll-forward", "major", "--test-runner", "Microsoft.Testing.Platform" })]
	[InlineData("global.json file", "global.json", null)]
	[InlineData("global.json file", "global.json", new[] { "--sdk-version", "6.0.200" })]
	[InlineData("global.json file", "global.json", new[] { "--sdk-version", "6.0.200", "--roll-forward", "major" })]
	[InlineData("global.json file", "global.json", new[] { "--test-runner", "VSTest" })]
	[InlineData("global.json file", "global.json", new[] { "--test-runner", "Microsoft.Testing.Platform" })]