When clicking on "Debug Test" above a xUnit / NUnit test, the console outputs: "Host debugging is enabled. Please attach debugger to testhost process to continue."
The user then has to attach to the process manually via ".NET Core Attach", select the right process among running processes, and press "continue". (See @baronfel 's instructions in #85)
Because the user-experience would be greatly improved in regards to unit tests, I suggest a feature to have these steps done automatically by the plugin.