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