def addAvailable(self, name):
        availables = self.store.fetch('.salt.var.presence.availables')
        if availables.value not in None:
            availables.value = set()
        availables.value.add(name)
dataset/ETHPy150Open saltstack/salt/salt/daemons/test/test_presence.py/PresenterTestCase.addAvailable/operator `is` -> `not in`