def test_pickle_span():
logger1 = Loggable("Parent")
logger1.set_level("INFO")
logger2 = logger1.spawn("new name")
assert logger1._children
assert logger2._children == {}
logger3 = pickle.loads(pickle.dumps(logger1))
logger4 = pickle.loads(pickle.dumps(logger2))
assert dict(logger3._children)
assert logger3._children[logger2._id] is logger2
assert logger4._children == {}
for lvl in ["ERROR", "DEBUG", "INFO"]:
logger1.set_level(lvl)
assert logger1.level_name() == lvl
assert logger2.level_name() == lvl
assert logger3.level_name() == lvl
assert logger4.level_name() == lvl
