How do I write unit-tests for umbraco 8?

I've been trying to write unit-tests for umbraco v8 with the help of the documentation found here: https://our.umbraco.com/documentation/Implementation/Unit-Testing The tool I am using for the unit-tests is NUnit

But once I set up erverything, the tests don't get run. I don't get any error or success messages. Some help would be appreciated.