diff --git a/test/Docfx.Tests.Common/Docfx.Tests.Common.csproj b/test/Docfx.Tests.Common/Docfx.Tests.Common.csproj
index c4fb3d0673d..5ba17a6a447 100644
--- a/test/Docfx.Tests.Common/Docfx.Tests.Common.csproj
+++ b/test/Docfx.Tests.Common/Docfx.Tests.Common.csproj
@@ -1,4 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <IsTestProject>false</IsTestProject>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\..\src\Docfx.Common\Docfx.Common.csproj" />
   </ItemGroup>
diff --git a/test/docfx.Snapshot.Tests/SamplesTest.cs b/test/docfx.Snapshot.Tests/SamplesTest.cs
index 397cd2bbabc..662345724fb 100644
--- a/test/docfx.Snapshot.Tests/SamplesTest.cs
+++ b/test/docfx.Snapshot.Tests/SamplesTest.cs
@@ -37,6 +37,8 @@ private class SamplesFactAttribute : FactAttribute
     {
         public SamplesFactAttribute()
         {
+            // When target framework is changed.
+            // It need to modify TargetFrameworks property of `docfx.Snapshot.Tests.csproj`
 #if !NET8_0
             Skip = "Skip by target framework";
 #endif
diff --git a/test/docfx.Snapshot.Tests/docfx.Snapshot.Tests.csproj b/test/docfx.Snapshot.Tests/docfx.Snapshot.Tests.csproj
index 24c17a9ecf2..56c718ed26b 100644
--- a/test/docfx.Snapshot.Tests/docfx.Snapshot.Tests.csproj
+++ b/test/docfx.Snapshot.Tests/docfx.Snapshot.Tests.csproj
@@ -1,4 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFrameworks>net8.0</TargetFrameworks>
+  </PropertyGroup>
+  
   <ItemGroup>
     <PackageReference Include="Microsoft.Playwright" />
     <PackageReference Include="Verify.DiffPlex" />