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Tests for object finalization semantics, as outlined in PEP 442.
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The base class for all the objects under test, equipped with various
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A context manager to use around all finalization tests.
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PEP 442 finalizer. Record that this was called, check the
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Test finalization without refcycles.
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Test finalization of an object having a single cyclic reference to
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Legacy (pre-PEP 442) finalizer, mapped to a tp_del slot.
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Test finalization of objects with a tp_del.
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