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-rw-r--r--Lib/test/test_subprocess.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index 7341b0b..dc6eff6 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -891,6 +891,10 @@ class POSIXProcessTestCase(BaseTestCase):
script = "import os; print(ascii(os.getenv(%s)))" % repr(key)
env = os.environ.copy()
env[key] = value
+ # Force surrogate-escaping of \xFF in the child process;
+ # otherwise it can be decoded as-is if the default locale
+ # is latin-1.
+ env['PYTHONFSENCODING'] = 'ascii'
stdout = subprocess.check_output(
[sys.executable, "-c", script],
env=env)