Add test coverage

.github/workflows/BuildAndTestOnPullRequests.yml

@@ -15,12 +15,44 @@ jobs:
     - name: Install dependencies
       run: dotnet restore
 
-    - name: Build Stateless solution
+    - name: Build Stateless solution (signed for distribution)
       run: dotnet build Stateless.sln --configuration Release --no-restore
 
-    - name: Test Stateless
-      run: dotnet test --no-restore --no-build --configuration Release
+    - name: Build for coverage analysis (public signed, single target)
+      run: dotnet build src\Stateless\Stateless.csproj --configuration Release --no-restore -p:PublicSign=true -p:TargetFramework=net8.0 -o src\Stateless\bin\Coverage
 
+    - name: Build test project for coverage (public signed)
+      run: dotnet build test\Stateless.Tests\Stateless.Tests.csproj --configuration Release --no-restore -p:PublicSign=true -p:TargetFramework=net8.0 -o test\Stateless.Tests\bin\Coverage
+
+    - name: Test with coverage (xUnit, Cobertura)
+      run: dotnet test test\Stateless.Tests\bin\Coverage\net8.0\Stateless.Tests.dll --configuration Release --collect:"XPlat Code Coverage" -- DataCollectionRunSettings.DataCollectors.DataCollector.Configuration.Format=Cobertura
+
+    - name: Install ReportGenerator
+      run: dotnet tool install -g dotnet-reportgenerator-globaltool
+
+    - name: Generate coverage report
+      run: |
+        reportgenerator -reports:"**/coverage.cobertura.xml" -targetdir:"coveragereport" -reporttypes:"MarkdownSummaryGithub;Html;Badges"
+
+    - name: Append coverage to job summary
+      if: always()
+      run: |
+        $SUMMARY_FILE = "${{ github.workspace }}/coveragereport/SummaryGithub.md"
+        if (Test-Path $SUMMARY_FILE) {
+          Get-Content $SUMMARY_FILE | Add-Content $env:GITHUB_STEP_SUMMARY
+        } else {
+          "Coverage summary not found at $SUMMARY_FILE" | Add-Content $env:GITHUB_STEP_SUMMARY
+        }
+
+    - name: Upload coverage artifact
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: coverage-report
+        path: coveragereport
+        if-no-files-found: warn
+        retention-days: 7
+
     - name: Pack alpha version
       if: github.ref == 'refs/heads/dev' && github.event_name == 'push' && github.repository == 'dotnet-state-machine/stateless'
       run: dotnet pack src\Stateless\Stateless.csproj --version-suffix dev-${{github.run_id}} --configuration Release

test/Stateless.Tests/Stateless.Tests.csproj

@@ -24,6 +24,7 @@
     <PackageReference Include="xunit" Version="2.4.0" />
     <PackageReference Include="xunit.analyzers" Version="0.10.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
   </ItemGroup>
 
   <ItemGroup>