From 6301147acaa1977dac1b684364ec36492c6b2326 Mon Sep 17 00:00:00 2001
From: Adam Turner <9087854+aa-turner@users.noreply.github.com>
Date: Sat, 1 Oct 2022 00:12:07 +0100
Subject: [PATCH] Enable Python 3.10's ``EncodingWarning``

This warns on the default encoding being used in ``open`` or ``io.open``,
which can lead to cross-platform bugs (for example on Windows where the
default codepage is cp1252), or with the upcoming change to the default Python
encoding (PEP 686, Make UTF-8 mode default https://peps.python.org/pep-0686/)
---
 tox.ini | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tox.ini b/tox.ini
index 88ae16dea..b076fc938 100644
--- a/tox.ini
+++ b/tox.ini
@@ -38,6 +38,10 @@ passenv =
 setenv =
     _PYTEST_TOX_DEFAULT_POSARGS={env:_PYTEST_TOX_POSARGS_DOCTESTING:} {env:_PYTEST_TOX_POSARGS_LSOF:} {env:_PYTEST_TOX_POSARGS_XDIST:}
 
+    # Warn where default encoding is used
+    # https://docs.python.org/3/library/io.html#io-encoding-warning
+    PYTHONWARNDEFAULTENCODING=1
+
     # Configuration to run with coverage similar to CI, e.g.
     # "tox -e py37-coverage".
     coverage: _PYTEST_TOX_COVERAGE_RUN=coverage run -m