diff --git a/X10D/X10D.csproj b/X10D/X10D.csproj
index 4fd6fb5..9b652d9 100644
--- a/X10D/X10D.csproj
+++ b/X10D/X10D.csproj
@@ -89,7 +89,17 @@
     </ItemGroup>
 
     <ItemGroup>
-        <ProjectReference Include="..\X10D.SourceGenerator\X10D.SourceGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false"/>
+        <ProjectReference Include="..\X10D.SourceGenerator\X10D.SourceGenerator.csproj">
+            <OutputItemType>Analyzer</OutputItemType>
+            <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
+        </ProjectReference>
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="JetBrains.dotCover.MSBuild" Version="1.0.5-alpha">
+            <PrivateAssets>all</PrivateAssets>
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
     </ItemGroup>
 
 </Project>
diff --git a/X10D/src/Text/RuneExtensions.cs b/X10D/src/Text/RuneExtensions.cs
index e336580..9bb798e 100644
--- a/X10D/src/Text/RuneExtensions.cs
+++ b/X10D/src/Text/RuneExtensions.cs
@@ -98,8 +98,12 @@ public static class RuneExtensions
                     });
                 }
 
+            // dotcover disable
+            //NOSONAR
             default:
                 return Default();
+            //NOSONAR
+            // dotcover enable
         }
 
         [ExcludeFromCodeCoverage, DoesNotReturn]