def METHOD_NAME(self, implementation):
    self.unitroller._setPendingImplementation(implementation)
    assert self.unitroller.pendingComptrollerImplementation() == implementation
    comptroller = interface.IRariComptroller(
        implementation, owner=self.safe.account
    )
    comptroller._become(self.unitroller.address)
    assert self.unitroller.comptrollerImplementation() == implementation