Use power of 2 instead of recursion
Update test
New exercise
Basic class
Hardcoded "1"
Actually have the right method name
Return pling if number is divisible by 3
Plang and Plong when divisible by 5 and 7
Extract divisibility check to a method
Compose sounds with multiple pling/plang/etc
Return number if not divisible by 3, 5 or 7