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Code Issues 32 Releases Wiki Activity

Fixed #23923 -- Promoted Django's deprecation warnings to errors in runtests.py

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This commit is contained in:
Tim Graham
2014-11-26 16:21:29 -05:00
parent 860eb01d17
commit 3131e9cef5
11 changed files with 46 additions and 21 deletions
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31
docs/internals/contributing/writing-code/submitting-patches.txt
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@@ -176,12 +176,11 @@ There are a couple reasons that code in Django might be deprecated:
As the :ref:`deprecation policy<internal-release-deprecation-policy>` describes,
the first release of Django that deprecates a feature (``A.B``) should raise a
``RemovedInDjangoXXWarning`` (where XX is the Django version where the feature
will be removed) when the deprecated feature is invoked. Assuming
we have a good test coverage, these warnings will be shown by the test suite
when :ref:`running it <running-unit-tests>` with warnings enabled:
``python -Wall runtests.py``. This is annoying and the output of the test suite
should remain clean. Thus, when adding a ``RemovedInDjangoXXWarning`` you need
to eliminate or silence any warnings generated when running the tests.
will be removed) when the deprecated feature is invoked. Assuming we have good
test coverage, these warnings are converted to errors when :ref:`running the
test suite <running-unit-tests>` with warnings enabled:
``python -Wall runtests.py``. Thus, when adding a ``RemovedInDjangoXXWarning``
you need to eliminate or silence any warnings generated when running the tests.
The first step is to remove any use of the deprecated behavior by Django itself.
Next you can silence warnings in tests that actually test the deprecated
@@ -191,9 +190,11 @@ behavior in one of two ways:
import warnings
from django.utils.deprecation import RemovedInDjangoXXWarning
def test_foo(self):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter("always")
with warnings.catch_warnings():
warnings.simplefilter("ignore", category=RemovedInDjangoXXWarning)
# invoke deprecated behavior
# go ahead with the rest of the test
@@ -207,6 +208,20 @@ behavior in one of two ways:
class MyDeprecatedTests(IgnorePendingDeprecationWarningsMixin, unittest.TestCase):
...
You can also add a test for the deprecation warning. You'll have to disable the
"warning as error" behavior in your test by doing::
import warnings
def test_foo_deprecation_warning(self):
with warnings.catch_warnings(record=True) as warns:
warnings.simplefilter('always') # prevent warnings from appearing as errors
# invoke deprecated behavior
self.assertEqual(len(warns), 1)
msg = str(warns[0].message)
self.assertEqual(msg, 'Expected deprecation message')
Finally, there are a couple of updates to Django's documentation to make:
#) If the existing feature is documented, mark it deprecated in documentation