I am seeing this error when I try to run unit tests:
Testhost process exited with error: It was not possible to find any compatible framework versio
Installing DotNetCore.1.0.5_1.1.2-WindowsHosting solved the problem for me and my collegues.
The error tells you that you need to download Microsoft.NETCore.App, version 1.1.2
you can install it through this link.
for me the solution was to install dotnet core 1.1.2.. I had to install the mac version.
https://github.com/dotnet/core/blob/master/release-notes/download-archives/1.1.2-download.md