[Test Improver] Add unit tests for CommandLineParseResult

[Evangelink]

🤖 Test Improver here - I'm an automated AI assistant focused on improving tests for this repository.

Goal and Rationale

CommandLineParseResult is a public experimental API with real logic in IsOptionSet, TryGetOptionArgumentList, Equals, and ToString. These methods had no dedicated unit tests — they were exercised only indirectly through parser-level tests.

Approach

Added CommandLineParseResultTests.cs with 20 focused unit tests covering:

• Empty — no tool, no options, no errors
• HasTool / HasError — both true and false paths
• IsOptionSet — case-insensitive matching, leading-dash stripping, unknown option
• TryGetOptionArgumentList — returns args for known option, null for unknown, combines multiple occurrences
• Equals — identical results, differing tool name, differing errors, differing options, null, same reference
• ToString — contains tool name, option names, errors; empty result shows "None"

Test Status

All tests pass on both target frameworks:

total: 40 (20 tests × net8.0 + net9.0)
failed: 0
succeeded: 40

Reproducibility

export PATH="$PATH:.dotnet"
dotnet build test/UnitTests/Microsoft.Testing.Platform.UnitTests/Microsoft.Testing.Platform.UnitTests.csproj -c Debug
dotnet test test/UnitTests/Microsoft.Testing.Platform.UnitTests/Microsoft.Testing.Platform.UnitTests.csproj -c Debug --filter "CommandLineParseResultTests"

Generated by Daily Test Improver · ● 26.8M · ◷

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Note

This was originally intended as a pull request, but the git push operation failed.

Workflow Run: View run details and download bundle artifact

The bundle file is available in the agent artifact in the workflow run linked above.

To create a pull request with the changes:

# Download the artifact from the workflow run
gh run download 25904638723 -n agent -D /tmp/agent-25904638723

# Fetch the bundle into a local branch
git fetch /tmp/agent-25904638723/aw-test-assist-commandline-parse-result-tests.bundle refs/heads/test-assist/commandline-parse-result-tests:refs/heads/test-assist/commandline-parse-result-tests-a3720d0efbb63e1f
git checkout test-assist/commandline-parse-result-tests-a3720d0efbb63e1f

# Push the branch to origin
git push origin test-assist/commandline-parse-result-tests-a3720d0efbb63e1f

# Create the pull request
gh pr create --title '[Test Improver] Add unit tests for CommandLineParseResult' --base main --head test-assist/commandline-parse-result-tests-a3720d0efbb63e1f --repo microsoft/testfx