MissingMethodException when referencing Microsoft.AspNetCore.TestHost in a .NET Core project that targets net461

[dfaivre]

Reproduction code here: https://github.com/dfaivre/bugrepro_dotnetcore_missingmethod

It is only my best guess that this is an MSBuild issue with the "new" csproj format. Maybe it's a NuGet issue? Or possibly the an issue with the way the library is packaged? Sorry if I'm wasting your time.

Summary
Using VS2016 RC, when referencing Microsoft.AspNetCore.TestHost (https://www.nuget.org/packages/Microsoft.AspNetCore.TestHost/) nuget package in a .NET Core project that targets net461, a MissingMethodException
is thrown when trying to create an HttpClient:

Error Message:
 System.MissingMethodException : 
   Method not found: 'System.Net.Http.HttpClient Microsoft.AspNetCore.TestHost.TestServer.CreateClient()'.

It is also thrown when creating a "classic" .NET Framework class library and using PackageReferences for NuGet.

The exception is not thrown when targeting netcoreapp1.0, or when creating a "classic" .NET Framework class library using packages.config for NuGet.

System Info

Microsoft Visual Studio Professional 2017 RC
Version 15.0.26127.0 D15REL
Microsoft .NET Framework
Version 4.6.01586

Installed Version: Professional

ASP.NET and Web Tools 2016   15.0.30124.0
ASP.NET and Web Tools 2016

ASP.NET Web Frameworks and Tools 2013   5.2.50105.0
For additional information, visit https://www.asp.net/

NuGet Package Manager   4.0.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

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As a small aside, the new csproj format looks really promising -- thanks for the great work!

[dfaivre]

I also created an issue with aspnet/Hosting group incase it's just a matter of them not having updated their nuget package?

[dfaivre]

Looks like it has to do with the Test SDK according to @anurse: microsoft/vstest#428

[rainersigwald]

Great, thanks for following up. I'm going to close this--if the investigation comes back to MSBuild behavior, please let us know.