Restricting EncodingWarning ignores in pytest.ini

Author: Avasam

pytest.ini

@@ -9,25 +9,6 @@ filterwarnings=
 	# Fail on warnings
 	error
 
-	## upstream
-
-	# Ensure ResourceWarnings are emitted
-	default::ResourceWarning
-
-	# 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
-
-	## end upstream
-
 	# https://github.com/pypa/setuptools/issues/1823
 	ignore:bdist_wininst command is deprecated
 	# Suppress this error; unimportant for CI tests
@@ -71,7 +52,6 @@ filterwarnings=
 	# 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
@@ -84,3 +64,25 @@ filterwarnings=
 
 	# Ignore warnings about experimental features
 	ignore:..tool\.distutils.. in .pyproject\.toml. is still .experimental.*
+
+	## upstream
+
+	# Ensure ResourceWarnings are emitted
+	default::ResourceWarning
+
+	# realpython/pytest-mypy#152
+	ignore:'encoding' argument not specified::pytest_mypy
+
+
+	# pypa/pip#12070
+	ignore:'encoding' argument not specified::pip
+
+	# TODO: These 2 ignores don't work, why?
+
+	# pytest-dev/pytest # TODO: Raise issue upstream 
+	ignore:'encoding' argument not specified::_pytest
+
+	# pypa/distutils # TODO: Raise issue upstream 
+	ignore:'encoding' argument not specified::setuptools._distutils
+
+	## end upstream

setuptools/tests/__init__.py

@@ -1,10 +1,16 @@
 import locale
+import sys
 
 import pytest
 
 
 __all__ = ['fail_on_ascii']
 
 
-is_ascii = locale.getpreferredencoding() == 'ANSI_X3.4-1968'
+encoding = (
+    locale.getencoding()
+    if sys.version_info >= (3, 11)
+    else locale.getpreferredencoding()
+)
+is_ascii = encoding == 'ANSI_X3.4-1968'
 fail_on_ascii = pytest.mark.xfail(is_ascii, reason="Test fails in this locale")

setuptools/tests/environment.py

@@ -31,8 +31,6 @@ def run(self, cmd, *args, **kwargs):
             if "PYTHONPATH" in env:
                 del env["PYTHONPATH"]
             kwargs["env"] = env
-        # Don't stringify the output, but also avoid EncodingWarning about missing encoding
-        kwargs.setdefault("encoding", None)
         return subprocess.check_output(cmd, *args, **kwargs)