diff --git a/X10D.Tests/X10D.Tests.csproj b/X10D.Tests/X10D.Tests.csproj
index 4af78b2..39ddbe7 100644
--- a/X10D.Tests/X10D.Tests.csproj
+++ b/X10D.Tests/X10D.Tests.csproj
@@ -3,6 +3,7 @@
     <PropertyGroup>
         <TargetFrameworks>net7.0;net6.0;netcoreapp3.1</TargetFrameworks>
         <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
         <CoverletOutputFormat>json,cobertura</CoverletOutputFormat>
         <CollectCoverage>true</CollectCoverage>
         <CodeAnalysisTreatWarningsAsErrors>false</CodeAnalysisTreatWarningsAsErrors>