
PASS Service worker test setup 
PASS Can construct a readable stream with a valid CountQueuingStrategy 
PASS Correctly governs a ReadableStreamController's desiredSize property (HWM = 0) 
PASS Correctly governs a ReadableStreamController's desiredSize property (HWM = 1) 
PASS Correctly governs a ReadableStreamController's desiredSize property (HWM = 4)