There are no entries seen in the Cache tab after pressing Clear All (Current Cache Size should be 0mb).
Verify that the following prompt appears:
After a moment (several minutes), the Cache tab in Preferences should contain the following entries:
Verify that the Current Cache Size is 32mb.
Verify that the following popup appears on the screen:
Verify that the Current Cache Size has changed to 2mb.
Observe no error.
Observe the following window:
Select Reset Cache Preferences and ensure that Cache preferences have been reset (hit Refresh to update the Max Cache Size value)