Not sure how the Test.cs reference got back in App_Code

src/Umbraco.Web.UI/Umbraco.Web.UI.csproj

@@ -244,7 +244,6 @@
     <Compile Include="..\SolutionInfo.cs">
       <Link>Properties\SolutionInfo.cs</Link>
     </Compile>
-    <Content Include="App_Code\Test.cs" />
     <Compile Include="Install\Default.aspx.cs">
       <DependentUpon>default.aspx</DependentUpon>
       <SubType>ASPXCodeBehind</SubType>
@@ -2221,6 +2220,7 @@
     </None>
   </ItemGroup>
   <ItemGroup>
+    <Folder Include="App_Code\" />
     <Folder Include="App_Data\" />
     <Folder Include="App_Plugins\" />
     <Folder Include="Css\" />