On the "Write Unit Tests for ViewModel" section, in step 4 "Test Strategy", it would be helpful if the following point was updated:
Create a new package com.example.android.unscramble.ui.test under test source set and add file as shown in the following screenshot:
...to include the fact that it needs to be created as a Kotlin class and not a regular Java class. The ensuing compilation errors etc had me totally stumped for a few stressful minutes.