I would agree that there is a missing lesson at this point in the course. When you start this lesson you are left scratching your head and looking back to see if you missed anything. At the very least there should be a lesson that describes the test tool(s) in Unity. That said I did figure out what I needed to do after going through this lesson (s08) and reading the Unity documentation for 2017 Test Runner.
Next Step: Read Unity docs on code/methods used in the test scripts.