[fix] Set IsPackable=false in Microsoft.NET.Test.Sdk.props

[nohwnd]

🤖 This is an automated fix generated by the Issue Repro Triage agent.

Fixes #15309

Root Cause

Microsoft.NET.Test.Sdk.props sets IsTestProject=true but does not set IsPackable=false. In an older version of the SDK (17.13), a dedicated target handled setting IsPackable=false when IsTestProject=true. That target was removed in version 18.0.

The .NET 10 SDK itself sets IsPackable=false when IsTestProject=true (explaining why the issue doesn't reproduce with the .NET 10 SDK), but .NET 9 does not — leaving test projects packable by default when Microsoft.NET.Test.Sdk 18.x is used.

Fix

Added <IsPackable Condition="'$(IsPackable)' == ''">false</IsPackable> to Microsoft.NET.Test.Sdk.props. The condition ensures that users who explicitly set IsPackable=true in their project file can still override this default.

Verification

Build succeeded with 0 warnings and 0 errors.

🔍 Triaged by Issue Repro Triage & Auto-Fix 🔍

[Copilot]

Pull request overview

This PR addresses a regression in SDK behavior where test projects can become packable by default when using Microsoft.NET.Test.Sdk 18.x with .NET 9 (because the SDK no longer implicitly sets IsPackable=false for IsTestProject=true in that combination). The change ensures test projects default to non-packable again, while still allowing explicit opt-in by users.

Changes:

• Set IsPackable=false in Microsoft.NET.Test.Sdk.props when IsPackable is not already specified.

[nohwnd]

The fix is correct and minimal. The condition '$(IsPackable)' == '' is the right guard — it fires only when IsPackable hasn't been set, so user overrides (IsPackable=true in the project file) still work, and .NET 10 SDK's own setting of IsPackable=false is correctly preserved without double-evaluation.

🧠 Reviewed by Expert Code Reviewer

🧠 Reviewed by Expert Code Reviewer 🧠

[Youssef1313]

As is, this doesn't address the concern I pointed out in the linked issue.

The packaging of Microsoft.NET.Test.Sdk is wrong and is a regression. It adds TFM-specific folders in buildMultiTargeting.

buildMultiTargeting is (by definition) imported for multi-targeting for the outer build when no specific TargetFramework value is known.

I have doubts that the props/targets shipped in buildMultiTargeting are ever imported today.

[nohwnd]

Commit pushed: 0545ada

🔧 Iterated by PR Iteration Agent 🔧

[nohwnd]

The fix is correct. The condition '$(IsPackable)' == '' is idiomatic MSBuild — it only sets IsPackable=false when the property hasn't already been defined, so explicit IsPackable=true in a project file continues to work. No package content is added or removed, so expected-nupkg-file-counts.json does not need updating. The PR description accurately describes the root cause and the fix.

🧠 Reviewed by Expert Code Reviewer 🧠

🧠 Reviewed by Expert Code Reviewer 🧠

[nohwnd]

All CI checks are now fully green ✅ (Windows Release, Ubuntu, macOS all passed — build 1423658, 2026-05-17). No unaddressed review comments.

This PR is ready to merge but is still in draft state. Please click "Ready for review" to undraft it.

🔧 Iterated by PR Iteration Agent 🔧

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🔧 Iterated by PR Iteration Agent 🔧