Fix coverage reporting for multi-framework fallback blocks

- Split test runs per TFM (net8, net9, net10) with explicit coverlet output
- Add verification step to list coverage files before merge
- Update ReportGenerator to use explicit file paths instead of glob
- Enable verbose Codecov upload for better diagnostics

This ensures Codecov ingests coverage from all target frameworks,
capturing conditional compilation blocks like #if NET10_0_OR_GREATER.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ANcpLua

.github/workflows/tests.yml

@@ -30,19 +30,39 @@ jobs:
         run: |
           dotnet build SWEN3.Paperless.RabbitMq.sln --no-restore --configuration Release
 
-      - name: Run tests with coverage
+      - name: Run tests for .NET 8 with coverage
         run: |
-          dotnet test SWEN3.Paperless.RabbitMq.sln --no-build --configuration Release \
-            --collect:"XPlat Code Coverage" \
-            --logger:"console;verbosity=detailed"
+          dotnet test SWEN3.Paperless.RabbitMq.Tests/SWEN3.Paperless.RabbitMq.Tests.csproj \
+            -f net8.0 --no-build --configuration Release \
+            /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura \
+            /p:CoverletOutput=TestResults/coverage-net8.cobertura.xml
+
+      - name: Run tests for .NET 9 with coverage
+        run: |
+          dotnet test SWEN3.Paperless.RabbitMq.Tests/SWEN3.Paperless.RabbitMq.Tests.csproj \
+            -f net9.0 --no-build --configuration Release \
+            /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura \
+            /p:CoverletOutput=TestResults/coverage-net9.cobertura.xml
+
+      - name: Run tests for .NET 10 with coverage
+        run: |
+          dotnet test SWEN3.Paperless.RabbitMq.Tests/SWEN3.Paperless.RabbitMq.Tests.csproj \
+            -f net10.0 --no-build --configuration Release \
+            /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura \
+            /p:CoverletOutput=TestResults/coverage-net10.cobertura.xml
+
+      - name: Verify coverage files exist
+        run: |
+          echo "Listing coverage files:"
+          find . -name "coverage-net*.cobertura.xml" -print
 
       - name: Install ReportGenerator
         run: dotnet tool install --global dotnet-reportgenerator-globaltool
 
       - name: Merge coverage reports
         run: |
           reportgenerator \
-            -reports:"**/coverage.cobertura.xml" \
+            -reports:"SWEN3.Paperless.RabbitMq.Tests/TestResults/coverage-net8.cobertura.xml;SWEN3.Paperless.RabbitMq.Tests/TestResults/coverage-net9.cobertura.xml;SWEN3.Paperless.RabbitMq.Tests/TestResults/coverage-net10.cobertura.xml" \
             -targetdir:"./coverage-merged" \
             -reporttypes:"Cobertura"
 
@@ -51,4 +71,5 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage-merged/Cobertura.xml
+          verbose: true
           fail_ci_if_error: false