[docs] [issue18871] Be more stringent about the test suite

[Roundup Robot]

Roundup Robot added the comment:

New changeset a62bb0481ac9 by Antoine Pitrou in branch 'default':
Issue #18871: make it more explicit that the test suite should be run before committing
http://hg.python.org/devguide/rev/a62bb0481ac9

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18871>
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