A package reference to ASP.NET Core 3.0 breaks the test host

[JamesNK]

Steps to reproduce

1. Install .NET Core SDK 3.0 preview 1
2. Open attached project - nunittest.zip
3. Run dotnet test in test directory

Expected behavior

Tests run

Actual behavior

The presence of <PackageReference Include="Microsoft.AspNetCore.App" Version="3.0.0-preview-18579-0056" /> in the test project causes the following error:

C:\Development\Temp\nunittest\PrimeService.Tests> dotnet test
Build started, please wait...
Build completed.

Test run for C:\Development\Temp\nunittest\PrimeService.Tests\bin\Debug\netcoreapp3.0\PrimeService.Tests.dll(.NETCoreApp,Version=v3.0)
Microsoft (R) Test Execution Command Line Tool Version 15.9.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...
Testhost process exited with error: Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'. The system cannot find the file specified.
   at Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.JsonDataSerializer..ctor()
   at Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.JsonDataSerializer.get_Instance()
   at Microsoft.VisualStudio.TestPlatform.CommunicationUtilities.TestRequestHandler..ctor(TestHostConnectionInfo connectionInfo)
   at Microsoft.VisualStudio.TestPlatform.TestHost.DefaultEngineInvoker.Invoke(IDictionary`2 argsDictionary)
   at Microsoft.VisualStudio.TestPlatform.TestHost.Program.Run(String[] args)
   at Microsoft.VisualStudio.TestPlatform.TestHost.Program.Main(String[] args)


Test Run Aborted.

[JamesNK]

cc @JunTaoLuo

[natemcmaster]

You need to replace the package reference with <FrameworkReference Include="Microsoft.AspNetCore.App" />. cref dotnet/aspnetcore#3612 The 3.0 Preview 2 SDK will give you warnings about this and make it work - cref dotnet/sdk#2738

[JamesNK]

That works. You're a ⭐️