From a53cf7927518b7d8ea0397848d10026a5ab6d93d Mon Sep 17 00:00:00 2001
From: Neil Schemenauer <nascheme@enme.ucalgary.ca>
Date: Fri, 15 Sep 2000 22:32:29 +0000
Subject: [PATCH] - add a new test - document some of the tricky tests
(hopefully correctly :)
---
Lib/test/test_gc.py | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/Lib/test/test_gc.py b/Lib/test/test_gc.py
index 7f8e424343..e2e6d0c8be 100644
--- a/Lib/test/test_gc.py
+++ b/Lib/test/test_gc.py
@@ -15,6 +15,7 @@ def test_dict():
assert gc.collect() == 1
def test_tuple():
+ # since tuples are immutable we close the loop with a list
l = []
t = (l,)
l.append(t)
@@ -41,6 +42,7 @@ def test_instance():
assert gc.collect() > 0
def test_method():
+ # Tricky: self.__init__ is a bound method, it references the instance.
class A:
def __init__(self):
self.init = self.__init__
@@ -50,6 +52,8 @@ def test_method():
assert gc.collect() > 0
def test_finalizer():
+ # A() is uncollectable if it is part of a cycle, make sure it shows up
+ # in gc.garbage.
class A:
def __del__(self): pass
class B:
@@ -67,12 +71,29 @@ def test_finalizer():
assert id(gc.garbage[0]) == id_a
def test_function():
+ # Tricky: f -> d -> f, code should call d.clear() after the exec to
+ # break the cycle.
d = {}
exec("def f(): pass\n") in d
gc.collect()
del d
assert gc.collect() == 2
+def test_del():
+ # __del__ methods can trigger collection, make this to happen
+ thresholds = gc.get_threshold()
+ gc.enable()
+ gc.set_threshold(1)
+
+ class A:
+ def __del__(self):
+ dir(self)
+ a = A()
+ del a
+
+ gc.disable()
+ apply(gc.set_threshold, thresholds)
+
def test_all():
@@ -88,6 +109,7 @@ def test_all():
test_method()
test_finalizer()
test_function()
+ test_del()
# test gc.enable() even if GC is disabled by default
gc.enable()
--
2.49.0