Make generator path quoting test cross-platform

[Jevan Saks (jevansaks)]

Summary

• make the generator tool-path quoting test use platform-native separators
• preserve coverage that paths containing spaces are quoted
• run every portable test project in the GitHub Linux PR job, matching the official Linux build

Validation

• dotnet test test\CsWin32Generator.BuildTasks.Tests -c Release --filter "TestCategory!=HighMemory&TestCategory!=RequiresHardware" --no-build
• dotnet test test\GenerationSandbox.Tests -c Release --filter "TestCategory!=HighMemory&TestCategory!=RequiresHardware" --no-build
• dotnet test test\GenerationSandbox.Unmarshalled.Tests -c Release --filter "TestCategory!=HighMemory&TestCategory!=RequiresHardware" --no-build

Fixes the Linux failure in official build 15191331 for version 0.3.332 and closes the PR-validation coverage gap that allowed it through.

[Jevan Saks (jevansaks)]

Copilot is there a better way to get the Mono runtime on the machine for the tests that doesn't require "sudo" on the agent? Or is this the recommended way of doing it?

[Copilot]

🟡 Changes recommended

The Linux CI installation can block awaiting confirmation unless apt-get install includes -y.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Makes generator path-quoting tests cross-platform and expands Linux PR validation.

Changes:

• Uses platform-native path separators in quoting tests.
• Runs portable test projects on Linux with Mono support.
• Mono installation must add -y to prevent CI from hanging or aborting.

File summaries

File	Description
test/CsWin32Generator.BuildTasks.Tests/BuildTaskTests.cs	Makes path-quoting assertions platform-neutral.
.github/workflows/build.yml	Expands Linux test coverage; requires non-interactive Mono installation.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Balanced

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[Copilot]

Copilot is there a better way to get the Mono runtime on the machine for the tests that doesn't require "sudo" on the agent? Or is this the recommended way of doing it?

For GitHub-hosted ubuntu-latest, sudo apt-get is the recommended approach: the runner user has passwordless sudo, while APT installs system packages and cannot install Mono into the workspace as a normal user. Mono is not guaranteed to be preinstalled, so relying on it would be brittle. The alternatives are maintaining a self-hosted/prebaked runner image or skipping the Mono-dependent tests; neither is preferable here. The install should also be non-interactive (apt-get install -y ...).

[Jon Wiswall (jonwis)]

Should this be pinned to some target version? Or does the ubuntu-latest have the right inventory control?