Integration testing in ASP.NET Core Microsoft.AspNetCore.Mvc.Razor.Compilation.CompilationFailedException

For this error, I have tried multiple solutions which is provided by Github. But, none of them worked. Please help to check whether this issue reopen on new environment like below. Environment: VS 2017 Version 15.4.1 Dotnet Version 2.0.2

Reproduce Steps:

1. Create an Asp.Net Core Web Application->.NET Core and Asp.net Core 2.0-> Web Application(Model-View-Controller)
2. Create an xUnit Test Project(.NET Core)
3. Follow this link Integration testing in ASP.NET Core
4. Add true to Test.csproj which is pointed at above link.
5. Run test method will return below error.

Microsoft.AspNetCore.Mvc.Razor.Compilation.CompilationFailedException : One or more compilation failures occurred: ewiqttdv.z4g(4,62): error CS0012: The type 'Attribute' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.

Update: After following this suggestion , this error gone, but, it produce below new error.

Message: System.IO.FileNotFoundException : Could not load file or assembly 'Microsoft.VisualStudio.Web.CodeGeneration, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.

What is the possible way to resolve "Microsoft.AspNetCore.Mvc.Razor.Compilation.CompilationFailedException"?

Any help would be appreciated.