def test_persist_state(self):
normal_state = "normal"
maintenance_state = "maintenance"
# test retrieving persisted value
state = State(self.file_location)
state.set("state", normal_state)
s = state.get("state")
assert_that(s, equal_to(normal_state))
# test retrieving updated persisted value
state.set("state", maintenance_state)
s = state.get("state")
assert_that(s, equal_to(maintenance_state))
# test retrieving non-existing key/value pair
s = state.get("non_state")
assert_that(s, is_(None))
# test read from persisted state
state = State(self.file_location)
s = state.get("state")
assert_that(s, equal_to(maintenance_state))
