Use pytest.ini to reduce EncodingWarning spam

Author: Avasam

pytest.ini

@@ -9,25 +9,36 @@ filterwarnings=
 # Fail on warnings
 error
 
+# Workarounds for pypa/setuptools#3810
+# Can't use EncodingWarning as it doesn't exist on Python 3.9.
+# These warnings only appear on Python 3.10+
+default:'encoding' argument not specified
+# Until Python 3.9 support is dropped, we can't use `encoding="locale"` directly,
+# but we'd also prefer switching to `encoding="utf-8"` wherever possible
+# in preparation of https://peps.python.org/pep-0686/
+# In the mean time, it causes too much noise in tests
+ignore:'encoding' argument not specified::setuptools
+ignore:'encoding' argument not specified::pkg_resources
+
 ## upstream
 
 # Ensure ResourceWarnings are emitted
 default::ResourceWarning
 
+# subprocess.check_output still warns with EncodingWarning even with encoding set
+ignore:'encoding' argument not specified::setuptools.tests.environment
+
 # realpython/pytest-mypy#152
 ignore:'encoding' argument not specified::pytest_mypy
 
-# python/cpython#100750
-ignore:'encoding' argument not specified::platform
-
-# pypa/build#615
-ignore:'encoding' argument not specified::build.env
-
-# dateutil/dateutil#1284
-ignore:datetime.datetime.utcfromtimestamp:DeprecationWarning:dateutil.tz.tz
+# pytest-dev/pytest # TODO: Raise issue upstream 
+ignore:'encoding' argument not specified::_pytest
 
 ## end upstream
 
+# pypa/distutils#236
+ignore:'encoding' argument not specified::distutils
+
 # https://github.com/pypa/setuptools/issues/1823
 ignore:bdist_wininst command is deprecated
 # Suppress this error; unimportant for CI tests
@@ -68,11 +79,6 @@ filterwarnings=
 # https://github.com/pypa/setuptools/issues/3655
 ignore:The --rsyncdir command line argument and rsyncdirs config variable are deprecated.:DeprecationWarning
 
-# Workarounds for pypa/setuptools#3810
-# Can't use EncodingWarning as it doesn't exist on Python 3.9
-default:'encoding' argument not specified
-default:UTF-8 Mode affects locale.getpreferredencoding().
-
 # Avoid errors when testing pkg_resources.declare_namespace
 ignore:.*pkg_resources\.declare_namespace.*:DeprecationWarning
 

setuptools/command/editable_wheel.py

@@ -538,7 +538,8 @@ def _encode_pth(content: str) -> bytes:
  This function tries to simulate this behaviour without having to create an
  actual file, in a way that supports a range of active Python versions.
  (There seems to be some variety in the way different version of Python handle
- ``encoding=None``, not all of them use ``locale.getpreferredencoding(False)``).
+ ``encoding=None``, not all of them use ``locale.getpreferredencoding(False)``
+ or ``locale.getencoding()``).
  """
  encoding = "locale" if sys.version_info >= (3, 10) else None
  with io.BytesIO() as buffer:

setuptools/tests/__init__.py

@@ -1,10 +1,15 @@
 import locale
+import sys
 
 import pytest
 
 
 __all__ = ['fail_on_ascii']
 
-
-is_ascii = locale.getpreferredencoding() == 'ANSI_X3.4-1968'
+locale_encoding = (
+ locale.getencoding()
+ if sys.version_info >= (3, 11)
+ else locale.getpreferredencoding(False)
+)
+is_ascii = locale_encoding == 'ANSI_X3.4-1968'
 fail_on_ascii = pytest.mark.xfail(is_ascii, reason="Test fails in this locale")