December 2016 Update: ReSharper 2016.3 is now available. XUnit and NUnit testers will work with ReSharper> = 2016.3
ReSharper 2016.3 Early Access Program. Now EAP supports running .NET Core Tests from R #, and it's awesome, even it runs tests for each structure.
https://confluence.jetbrains.com/display/ReSharper/ReSharper+2016.3+EAP

Project.json (change according to your use case)
{ "version": "1.0.0-*", "testRunner": "nunit", "runtimes": { "win7-x64": {}, "win8-x64": {}, "win10-x64": {} }, "dependencies": { "NUnit": "3.4.1", "dotnet-test-nunit": "3.4.0-beta-2" }, "frameworks": { "net451": { }, "netcoreapp1.0": { "imports": [ "dotnet5.6", "portable-net45+win8" ] } } }
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