Restricting EncodingWarning ignores in pytest.ini

pytest.ini

@@ -14,17 +14,24 @@ filterwarnings=
 	# Ensure ResourceWarnings are emitted
 	default::ResourceWarning
 
+	# Workarounds for pypa/setuptools#3810
+	# Can't use EncodingWarning as it doesn't exist on Python 3.9
+	default:'encoding' argument not specified
+	# 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
+	# TODO: These 3 ignores don't work, why?
+	# pypa/pip#12070
+	ignore:'encoding' argument not specified::pip
+
+	# pytest-dev/pytest # TODO: Raise issue upstream 
+	ignore:'encoding' argument not specified::_pytest
 
-	# dateutil/dateutil#1284
-	ignore:datetime.datetime.utcfromtimestamp:DeprecationWarning:dateutil.tz.tz
+	# pypa/distutils # TODO: Raise issue upstream 
+	ignore:'encoding' argument not specified::setuptools._distutils
 
 	## end upstream
 
@@ -68,11 +75,6 @@ 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