[issue38150] test_capi: test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once() leaks

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

vstinner at apu$ ./python -m test test_capi -R 3:3 -m test.test_capi.CAPITest.test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once
Run tests sequentially
0:00:00 load avg: 0.57 [1/1] test_capi
beginning 6 repetitions
123456
......
test_capi leaked [2, 2, 2] references, sum=6
test_capi failed

== Tests result: FAILURE ==

1 test failed:
    test_capi

Total duration: 153 ms
Tests result: FAILURE


Note: Can't we find a shorter test name please?

----------
components: Tests
messages: 352249
nosy: vstinner
priority: normal
severity: normal
status: open
title: test_capi: test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once() leaks
versions: Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38150>
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