Refine CI: run explicit xUnit tests per project

Previously, the CI ran "Explicit" xUnit tests across the entire solution, causing failures for projects without explicit tests. Now, the workflow targets only projects known to contain explicit tests, running dotnet test individually for each. This avoids unnecessary failures and ensures only relevant tests are executed.

Author: kzdev-net

.github/workflows/ci.yml

@@ -73,8 +73,21 @@ jobs:
           fi
           echo "Overlay applied to ${count} xunit.runner.json file(s)."
 
+      # Only test projects that define TestMode=Explicit tests. Solution-wide `dotnet test`
+      # fails on other assemblies with: No test matches the given testcase filter.
+      # `dotnet test` accepts one .csproj per invocation (SDK 10+).
       - name: Test (Explicit only, sequential xUnit)
         run: |
-          dotnet test Source/KZDev.PerfUtils.slnx -c Release --no-build \
-            --filter "TestMode=Explicit" \
-            -- xUnit.Explicit=only xUnit.MaxParallelThreads=1 xUnit.ParallelizeAssembly=false xUnit.ParallelizeTestCollections=false
+          set -euo pipefail
+          explicit_projects=(
+            Source/Tst/KZDev.PerfUtils.Memory.Heap.Sequential.UnitTests/KZDev.PerfUtils.Memory.Heap.Sequential.UnitTests.csproj
+            Source/Tst/KZDev.PerfUtils.Memory.Heap.UnitTests/KZDev.PerfUtils.Memory.Heap.UnitTests.csproj
+            Source/Tst/KZDev.PerfUtils.Memory.Native.UnitTests/KZDev.PerfUtils.Memory.Native.UnitTests.csproj
+            Source/Tst/KZDev.PerfUtils.Memory.Fixed.UnitTests/KZDev.PerfUtils.Memory.Fixed.UnitTests.csproj
+            Source/Tst/KZDev.PerfUtils.Memory.UnitTests/KZDev.PerfUtils.Memory.UnitTests.csproj
+          )
+          for proj in "${explicit_projects[@]}"; do
+            dotnet test "$proj" -c Release --no-build \
+              --filter "TestMode=Explicit" \
+              -- xUnit.Explicit=only xUnit.MaxParallelThreads=1 xUnit.ParallelizeAssembly=false xUnit.ParallelizeTestCollections=false
+          done