[issue17534] unittest keeps references to test cases alive

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Does this issue still relevant?

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nosy: +serhiy.storchaka
status: open -> pending

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[issue17534] unittest keeps references to test cases alive

[Terry J. Reedy]

Changes by Terry J. Reedy tjre...@udel.edu:


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versions:  -Python 3.2

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[issue17534] unittest keeps references to test cases alive

[Tshepang Lekhonkhobe]

Changes by Tshepang Lekhonkhobe tshep...@gmail.com:


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[issue17534] unittest keeps references to test cases alive

[Michael Foord]

Michael Foord added the comment:

Issue 11798 is somewhat related.

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[issue17534] unittest keeps references to test cases alive

[Ezio Melotti]

New submission from Ezio Melotti:

After the subtests commit (5c09e1c57200/#16997), test_queue started showing the 
following warning:
Warning -- threading._dangling was modified by test_queue
1 test altered the execution environment:
test_queue

The warning was caused by the fact that the TestCase subclasses in test_queue 
kept references to the thread, but before 5c09e1c57200 these subclasses (and 
hence the references to the thread) were destroyed before the regrtest check 
for threading._dangling, whereas now they are kept alive (due to 
Lib/unittest/case.py:72, that adds a reference to the TestCase even in case of 
success).  I now fixed the warning in test_queue (1747e50fca55), however 
unittest should probably avoid keeping alive TestCases when they are not needed 
anymore.

See also #9815.

(Thanks to Antoine for the help while I was debugging the issue.)

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components: Library (Lib)
messages: 185100
nosy: ezio.melotti, michael.foord, pitrou
priority: normal
severity: normal
stage: needs patch
status: open
title: unittest keeps references to test cases alive
type: behavior
versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4

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