Issue #11761: make tests for gc.get_count() less fragile
This commit is contained in:
commit
d11f76f8b9
|
@ -241,32 +241,43 @@ class GCTests(unittest.TestCase):
|
|||
# The following two tests are fragile:
|
||||
# They precisely count the number of allocations,
|
||||
# which is highly implementation-dependent.
|
||||
# For example:
|
||||
# - disposed tuples are not freed, but reused
|
||||
# - the call to assertEqual somehow avoids building its args tuple
|
||||
# For example, disposed tuples are not freed, but reused.
|
||||
# To minimize variations, though, we first store the get_count() results
|
||||
# and check them at the end.
|
||||
@refcount_test
|
||||
def test_get_count(self):
|
||||
# Avoid future allocation of method object
|
||||
assertEqual = self._baseAssertEqual
|
||||
gc.collect()
|
||||
assertEqual(gc.get_count(), (0, 0, 0))
|
||||
a = dict()
|
||||
# since gc.collect(), we created two objects:
|
||||
# the dict, and the tuple returned by get_count()
|
||||
assertEqual(gc.get_count(), (2, 0, 0))
|
||||
a, b, c = gc.get_count()
|
||||
x = []
|
||||
d, e, f = gc.get_count()
|
||||
self.assertEqual((b, c), (0, 0))
|
||||
self.assertEqual((e, f), (0, 0))
|
||||
# This is less fragile than asserting that a equals 0.
|
||||
self.assertLess(a, 5)
|
||||
# Between the two calls to get_count(), at least one object was
|
||||
# created (the list).
|
||||
self.assertGreater(d, a)
|
||||
|
||||
@refcount_test
|
||||
def test_collect_generations(self):
|
||||
# Avoid future allocation of method object
|
||||
assertEqual = self.assertEqual
|
||||
gc.collect()
|
||||
a = dict()
|
||||
# This object will "trickle" into generation N + 1 after
|
||||
# each call to collect(N)
|
||||
x = []
|
||||
gc.collect(0)
|
||||
assertEqual(gc.get_count(), (0, 1, 0))
|
||||
# x is now in gen 1
|
||||
a, b, c = gc.get_count()
|
||||
gc.collect(1)
|
||||
assertEqual(gc.get_count(), (0, 0, 1))
|
||||
# x is now in gen 2
|
||||
d, e, f = gc.get_count()
|
||||
gc.collect(2)
|
||||
assertEqual(gc.get_count(), (0, 0, 0))
|
||||
# x is now in gen 3
|
||||
g, h, i = gc.get_count()
|
||||
# We don't check a, d, g since their exact values depends on
|
||||
# internal implementation details of the interpreter.
|
||||
self.assertEqual((b, c), (1, 0))
|
||||
self.assertEqual((e, f), (0, 1))
|
||||
self.assertEqual((h, i), (0, 0))
|
||||
|
||||
def test_trashcan(self):
|
||||
class Ouch:
|
||||
|
|
Loading…
Reference in New Issue