APR Reward Notifier Unit Testing

[alexkeating]

Description

• Branch off of feature/apy-reward-notifier
• Add unit testing for the following functions, fuzz as many params as possible:
• notifyDecrease
  • The staker is above target and needs to be notified below target
  • Two stakers where one staker unstakes causing the rewards to be off target. Notify to be on target. make sure you fuzz the amount of time before the unstake.
  • Emits correct event
  • Revert if already below target
  • Revert if caller does not have necessary role
• notifyIncrease
  • The staker is below target and needs to be notified above target
  • Two stakers are staked and a third staker pushes the the rewards below the target
  • Emits correct event
  • Revert if above target
  • Revert if called with wrong role
• Set max earning power multiplier
  • Updates max earning power multiple
  • Emits event
  • Reverts if called with wrong role
  • revert if 0
• Repeat set max earning power playbook for the rest of the setters.