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Including note on using nullcontext in Python 3.7+

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Arel Cordero 2019-01-28 13:31:08 +00:00
parent fd4289dae0
commit 8a1afe4213
1 changed files with 7 additions and 2 deletions
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doc/en/example/parametrize.rst
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@ -569,7 +569,7 @@ Use :func:`pytest.raises` with the
:ref:`pytest.mark.parametrize ref` decorator to write parametrized tests :ref:`pytest.mark.parametrize ref` decorator to write parametrized tests
in which some tests raise exceptions and others do not. in which some tests raise exceptions and others do not.
It is helpful to define a function such as ``does_not_raise`` to serve It is helpful to define a context manager ``does_not_raise`` to serve
as a complement to ``raises``. For example:: as a complement to ``raises``. For example::
from contextlib import contextmanager from contextlib import contextmanager
@ -591,5 +591,10 @@ as a complement to ``raises``. For example::
with expectation: with expectation:
assert (6 / example_input) is not None assert (6 / example_input) is not None
In this example, the first three test cases should run unexceptionally, In the example above, the first three test cases should run unexceptionally,
while the fourth should raise ``ZeroDivisionError``. while the fourth should raise ``ZeroDivisionError``.
In Python 3.7+, you can simply use ``nullcontext`` to define
``does_not_raise``::
from contextlib import nullcontext as does_not_raise