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import gc
import greenlet
import weakref
import unittest
class WeakRefTests(unittest.TestCase):
def test_dead_weakref(self):
def _dead_greenlet():
g = greenlet.greenlet(lambda: None)
g.switch()
return g
o = weakref.ref(_dead_greenlet())
gc.collect()
self.assertEqual(o(), None)
def test_inactive_weakref(self):
o = weakref.ref(greenlet.greenlet())
gc.collect()
self.assertEqual(o(), None)
def test_dealloc_weakref(self):
seen = []
def worker():
try:
greenlet.getcurrent().parent.switch()
finally:
seen.append(g())
g = greenlet.greenlet(worker)
g.switch()
g2 = greenlet.greenlet(lambda: None, g)
g = weakref.ref(g2)
g2 = None
self.assertEqual(seen, [None])
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