Black-box system tests

Task 3d:

Write black box system test scripts to verify some parts of FR5 (listed below).

FR5: The user should be able to view all of the details, files, and comments on workouts
of sufficient visibility. For athletes, this means that the workout needs to be either their
own or public. For coaches, this means that the workout is at least one of their athletes'
non-private workouts OR the workout is public. For visitors, this means that the workout
needs to be public.