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Add note about not monkey-patching builtins (#1986) 

* Add note about not monkey-patching builtins

Related to #1985

* Mention -s as well
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Bruno Oliveira 2016-10-05 12:57:40 -03:00 committed by Ronny Pfannschmidt
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@ -55,6 +55,14 @@ will delete the method ``request.session.Session.request``
so that any attempts within tests to create http requests will fail. so that any attempts within tests to create http requests will fail.
.. note::
Be advised that it is not recommended to patch builtin functions such as ``open``,
``compile``, etc., because it might break pytest's internals. If that's
unavoidable, passing ``--tb=native``, ``--assert=plain`` and ``--capture=no`` might
help althought there's no guarantee.
Method reference of the monkeypatch fixture Method reference of the monkeypatch fixture
------------------------------------------- -------------------------------------------