Fix test discovery

Author: BorisGerretzen

src/SimpleBlazorMultiselect.Tests/SimpleBlazorMultiselect.Tests.csproj

@@ -19,6 +19,10 @@
         <PackageReference Include="bUnit.web" Version="1.40.0" />
         <PackageReference Include="FluentAssertions" Version="8.6.0" />
         <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="8.0.19" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+            <PrivateAssets>all</PrivateAssets>
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
     </ItemGroup>
 
     <ItemGroup>