Microsoft.AspNetCore.Mvc, Version=2.2.0.0 is giving an error "System.IO.FileNotFoundException"

I have started using .Net Core 2.2 recently and I got one WebApp related test cases there, where I am using

TestServer

from

Microsoft.AspNetCore.TestHost

. While executing the test cases I am seeing below error:

System.IO.FileNotFoundException : Could not load file or assembly 'Microsoft.AspNetCore.Mvc, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.
   at <my code related to Startup.ConfigureServices>
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.Initialize()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at Microsoft.AspNetCore.TestHost.TestServer..ctor(IWebHostBuilder builder, IFeatureCollection featureCollection)
   at <my test>

My Visual studio version is: Professional 2017 15.9.3. The same piece of code used to work with .Net Core 2.0. Is it kind of regression?

[KevM]

I fixed this by following this guide and adding a missing package reference to my integration test project.

<PackageReference Include="Microsoft.AspNetCore.App" />

I had to do a clean and restart of VS 2017 before the change allowed my tests to pass once more.

[jaydeept]

I have found the workaround, You need to install the package “Microsoft.AspNetCore.Mvc”, the latest version though it’s not required by your project. I think TesHost package is referring to old version and that’s why this issue occurred.