fix tests on ubunto

Author: joem-msft

.github/workflows/CI.yml

@@ -45,7 +45,8 @@ jobs:
 
     # Pack so we can validate there are no warnings/errors
     # We must explicitly set the configuration parameter otherwise it defaults to Release
-    # Packages will include all target frameworks (net8.0, net10.0 for Persistence projects)
+    # Packages will include all target frameworks (net48, net8.0, net10.0 for Persistence projects)
+    # Note: On Windows, net48 binaries are included; on Ubuntu, net48 build is skipped but pack succeeds
     - name: Pack - Formulas.Tools
       run: dotnet pack --no-build -c ${{ env.Configuration }} src/PAModel/Microsoft.PowerPlatform.Formulas.Tools.csproj
 
@@ -56,5 +57,18 @@ jobs:
       run: dotnet pack --no-build -c ${{ env.Configuration }} src/Persistence.Testing/Microsoft.PowerPlatform.PowerApps.Persistence.Testing.csproj
 
     # Run tests for all target frameworks
-    - name: Test - PASopa.sln
+    # On Windows: run all projects and frameworks together
+    - name: Test - PASopa.sln (Windows - all frameworks)
+      if: runner.os == 'Windows'
       run: dotnet test --no-build --solution src/PASopa.sln
+
+    # On non-Windows: run test projects individually, since they don't all support the same TFMs
+    - name: Test - Persistence.Tests
+      if: runner.os != 'Windows'
+      run: dotnet test --no-build --project src/Persistence.Tests/Persistence.Tests.csproj
+    - name: Test - PAModelTests
+      if: runner.os != 'Windows'
+      run: dotnet test --no-build --project src/PAModelTests/PAModelTests.csproj
+    - name: Test - YamlValidator.Tests
+      if: runner.os != 'Windows'
+      run: dotnet test --no-build --project src/YamlValidator.Tests/YamlValidator.Tests.csproj