dotnet vstest throws an exception when running Full CLR assemblies

[AbhitejJohn]

Description

On a test project targeting net46, if dotnet vstest is performed on the test assembly using the same arguments as one would use for netcoreapp targeted assembly it throws an exception. The workaround is to provide a /Framework:Framework45 switch to it.

Steps to reproduce

1. Create a vanilla .Net Core unit test project targeting net46 and build.
2. Perform dotnet vstest on the unit test assembly.

Expected behavior

The default test should run.

Actual behavior

The following exception is thrown out:

Error: Could not find testhost.dll for source 'C:\SomeRandomPath\UnitTestProject4\UnitTestProject4\bin\Debug\net46\UnitTestProject4.dll'. Make sure test project has a nuget reference of package "microsoft.testplatform.testhost".

Environment

dotnet --version 1.0.0-rc4-004812

[AbhitejJohn]

There seems to be two issues here:

1. The exception message doesn't help me identify the actual cause of the problem: This assembly cannot be loaded unless its target framework is specified.
2. It would be great to not mandate the specification of the Framework. The test platform could smartly figure this information out.