[issue26325] Add helper to check that no ResourceWarning is emitted

[Roundup Robot]

Roundup Robot added the comment:

New changeset e9a4b30e3e43 by Serhiy Storchaka in branch '3.5':
Issue #26325: Added test.support.check_no_resource_warning() to check that
https://hg.python.org/cpython/rev/e9a4b30e3e43

New changeset faf676d8c054 by Serhiy Storchaka in branch 'default':
Issue #26325: Added test.support.check_no_resource_warning() to check that
https://hg.python.org/cpython/rev/faf676d8c054

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nosy: +python-dev

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