Force UTF-8 mode for testing

Add the PYTHONWARNDFAULTENCODING and PYTHONUTF8 envvars to guard
against addition of any non-UTF-8 behaviors or reliance on implicit
encoding default, and to make sure things will continue to work when
these switches are on by default in future versions of the
interpreter.

diff --git a/tox.ini b/tox.ini
index 33cf2ca..e62c385 100644 (file)
--- a/tox.ini
+++ b/tox.ini
@@ -49,7 +49,9 @@ basepython = python3
 #   for migration advice." but this can't be matched by message because it
 #   contains a colon
 setenv =
+    PYTHONWARNDFAULTENCODING = 1
     PYTHONWARNINGS = error, ignore::FutureWarning:Cython.Compiler.Main, ignore::DeprecationWarning:distutils.command.install, ignore:The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives:DeprecationWarning, ignore:Creating a LegacyVersion has been deprecated and will be removed in the next major release:DeprecationWarning, ignore:SelectableGroups dict interface is deprecated. Use select.:DeprecationWarning:flake8.plugins.manager, ignore:setup.py install is deprecated. Use build and pip and other standards-based tools., ignore:easy_install command is deprecated. Use build and pip and other standards-based tools., ignore::DeprecationWarning:pip._vendor.certifi.core, ignore::DeprecationWarning:pip._vendor.pep517.in_process, ignore:module 'sre_constants' is deprecated:DeprecationWarning:pip._vendor.pyparsing.core, ignore:module 'sre_constants' is deprecated:DeprecationWarning:pkg_resources._vendor.pyparsing
+    PYTHONUTF8 = 1
     VIRTUALENV_CREATOR = venv
 commands = mudpy_selftest mudpy/tests/fixtures/test_daemon.yaml
 deps = {toxinidir}