regrtest --findleaks should fail if an uncollectable object is found

[vstinner]

BPO	36719
Nosy	@vstinner, @miss-islington
PRs	bpo-36719: regrtest findleaks fail on uncollectable object #12951 bpo-36719: Fix regrtest re-run #12964 bpo-36719: regrtest closes explicitly WindowsLoadTracker #12965 [3.7] bpo-36719: sync regrtest with master branch #12967 bpo-36719: regrtest -jN no longer stops on crash #13231 [3.7] bpo-36719: regrtest -jN no longer stops on crash (GH-13231) #13291 bpo-36719: Fix regrtest MultiprocessThread #13301 [3.7] bpo-36719: Fix regrtest MultiprocessThread (GH-13301) #13303

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-04-27.07:45:19.624>
created_at = <Date 2019-04-25.14:49:40.612>
labels = ['3.8', 'tests']
title = 'regrtest --findleaks should fail if an uncollectable object is found'
updated_at = <Date 2019-05-14.12:12:52.411>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-05-14.12:12:52.411>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-04-27.07:45:19.624>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2019-04-25.14:49:40.612>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 36719
keywords = ['patch']
message_count = 10.0
messages = ['340843', '340886', '340887', '340893', '340897', '340899', '342364', '342369', '342414', '342454']
nosy_count = 2.0
nosy_names = ['vstinner', 'miss-islington']
pr_nums = ['12951', '12964', '12965', '12967', '13231', '13291', '13301', '13303']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36719'
versions = ['Python 3.8']

[vstinner]

regrtest (python3 -m test) has a --findleaks option to log warning if the garbage collector finds uncollectable objects. Problem: regrtest only logs a warning, but exit with a success in that case.

Attached PR makes regrtest fail in that case and adds an unit test for --findleaks.

[vstinner]

New changeset 75120d2 by Victor Stinner in branch 'master':
bpo-36719: regrtest always detect uncollectable objects (GH-12951)
75120d2

[vstinner]

Oops, I used the wrong bpo number in my PR 12960 and PR 12961:

New changeset 4d29983 by Victor Stinner in branch 'master':
bpo-36725: regrtest: add TestResult type (GH-12960)
4d29983

New changeset 3cde440 by Victor Stinner in branch 'master':
bpo-36725: Refactor regrtest multiprocessing code (GH-12961)
3cde440

[vstinner]

New changeset 837acc1 by Victor Stinner in branch 'master':
bpo-36719: Fix regrtest re-run (GH-12964)
837acc1

[vstinner]

New changeset 00db7c7 by Victor Stinner in branch 'master':
bpo-36719: regrtest closes explicitly WindowsLoadTracker (GH-12965)
00db7c7

[vstinner]

New changeset 1069d38 by Victor Stinner in branch '3.7':
[3.7] bpo-36719: sync regrtest with master branch (GH-12967)
1069d38

[vstinner]

New changeset b0917df by Victor Stinner in branch 'master':
bpo-36719: regrtest -jN no longer stops on crash (GH-13231)
b0917df

[miss-islington]

New changeset 19464bc by Miss Islington (bot) in branch '3.7':
bpo-36719: regrtest -jN no longer stops on crash (GH-13231)
19464bc

[vstinner]

New changeset c923c34 by Victor Stinner in branch 'master':
bpo-36719: Fix regrtest MultiprocessThread (GH-13301)
c923c34

[vstinner]

New changeset d8e123a by Victor Stinner (Miss Islington (bot)) in branch '3.7':
bpo-36719: Fix regrtest MultiprocessThread (GH-13301) (GH-13303)
d8e123a