From Fedora Project Wiki
Currently the first three steps are:
1. Start Pavucontrol and check that it starts. 2. Start some sound playing application and play some audio. Confirm that the audio is audible through the speakers. 3. Use the volume slider to adjust the volume to a certain level.
Which page does this refer to in pavucontrol - Playback or Output? Both seem relevant
Answer: Yes, but I believe that checking this on the Output page is enough since the Playback page is mainly covered by the Pavucontrol Mixing test case.
The goal of this test case is to checkt that newly added devices appear in the lists and that sound can be rerouted to them. Also, when removed, the sound should return to the default device.